docs(guide/overview): Refactor overview and mvc docs

Before, there we multiple overview docs:
- guide/overview
- guide/introduction
- guide/dev_guide.mvc
- guide/dev_guide.mvc.understanding_model
- guide/dev_guide.mvc.understanding_view
- guide/concepts

Now we have:
- guide/introduction: High level description of Angular with the key benefits but without code or any concrete concepts
- guide/concepts: explains all important concepts with a simple example and contains deep links to the other parts of the guide.

 All the old information was moved into existing documents or deleted when they were duplicates.

Author: tbosch

docs/components/angular-bootstrap/bootstrap-prettify.js

@@ -169,21 +169,23 @@ directive.ngSetHtml = ['getEmbeddedTemplate', function(getEmbeddedTemplate) {
 directive.ngEvalJavascript = ['getEmbeddedTemplate', function(getEmbeddedTemplate) {
   return {
     compile: function (element, attr) {
-      var script = getEmbeddedTemplate(attr.ngEvalJavascript);
-
-      try {
-        if (window.execScript) { // IE
-          window.execScript(script || '""'); // IE complains when evaling empty string
-        } else {
-          window.eval(script);
-        }
-      } catch (e) {
-        if (window.console) {
-          window.console.log(script, '\n', e);
-        } else {
-          window.alert(e);
+      var fileNames = attr.ngEvalJavascript.split(' ');
+      angular.forEach(fileNames, function(fileName) {
+        var script = getEmbeddedTemplate(fileName);
+        try {
+          if (window.execScript) { // IE
+            window.execScript(script || '""'); // IE complains when evaling empty string
+          } else {
+            window.eval(script + '//@ sourceURL=' + fileName);
+          }
+        } catch (e) {
+          if (window.console) {
+            window.console.log(script, '\n', e);
+          } else {
+            window.alert(e);
+          }
         }
-      }
+      });
     }
   };
 }];

docs/content/api/index.ngdoc

@@ -8,6 +8,17 @@ Welcome to the AngularJS API docs page. These pages contain the AngularJS refere
 The documentation is organized into **modules** which contain various components of an AngularJS application.
 These components are directives, services, filters, providers, types, global APIs and testing mocks.
 
+<div class="alert alert-info">
+**Angular Namspaces `$` and `$$`**
+
+To prevent accidental name collisions with your code,
+Angular prefixes names of public objects with `$` and names of private objects with `$$`.
+Please do not use the `$` or `$$` prefix in your code.
+</div>
+
+## Angular Namespace
+
+
 ## {@link ng ng (core module)}
 This module is provided by default and contains the core components of AngularJS.
 

docs/content/cookbook/helloworld.ngdoc

@@ -34,6 +34,6 @@ Take a look through the source and note:
 * There is no need for listener registration and event firing on change events.
 * The implicit presence of the `name` variable which is in the root {@link api/ng.$rootScope.Scope scope}.
 * The double curly brace `{{markup}}`, which binds the name variable to the greeting text.
-* The concept of {@link guide/dev_guide.templates.databinding data binding}, which reflects any
+* The concept of {@link guide/databinding data binding}, which reflects any
 changes to the
   input field in the greeting text.

docs/content/guide/bootstrap.ngdoc

@@ -51,6 +51,8 @@ initialization.
 
 ## Automatic Initialization
 
+<img class="pull-right" style="padding-left: 3em;" src="img/guide/concepts-startup.png">
+
 Angular initializes automatically upon `DOMContentLoaded` event or when the `angular.js` script is
 evaluated if at that time `document.readyState` is set to `'complete'`. At this point Angular looks
 for the {@link api/ng.directive:ngApp `ng-app`} directive which designates your application root.

docs/content/guide/concepts.ngdoc

@@ -1,5 +1,5 @@
 @ngdoc overview
-@name Developer Guide: About MVC in Angular: Understanding the Controller Component
+@name Controllers
 @description
 
 # Understanding Controllers
@@ -85,7 +85,7 @@ expression in the template:
     </div>
 </pre>
 
-As discussed in the {@link dev_guide.mvc.understanding_model Model} section of this guide, any
+As discussed in the {@link concepts Concepts} section of this guide, any
 objects (or primitives) assigned to the scope become model properties. Any methods assigned to
 the scope are available in the template/view, and can be invoked via angular expressions
 and `ng` event handler directives (e.g. {@link api/ng.directive:ngClick ngClick}).
@@ -105,7 +105,7 @@ Do not use Controllers for:
 - Any kind of DOM manipulation — Controllers should contain only business logic. DOM
 manipulation (the presentation logic of an application) is well known for being hard to test.
 Putting any presentation logic into Controllers significantly affects testability of the business
-logic. Angular offers {@link dev_guide.templates.databinding databinding} for automatic DOM manipulation. If
+logic. Angular offers {@link databinding databinding} for automatic DOM manipulation. If
 you have to perform your own manual DOM manipulation, encapsulate the presentation logic in
 {@link guide/directive directives}.
 - Input formatting — Use {@link forms angular form controls} instead.
@@ -126,7 +126,7 @@ directive} or {@link api/ngRoute.$route $route service}.
 To illustrate further how Controller components work in Angular, let's create a little app with the
 following components:
 
-- A {@link dev_guide.templates template} with two buttons and a simple message
+- A {@link templates template} with two buttons and a simple message
 - A model consisting of a string named `spice`
 - A Controller with two functions that set the value of `spice`
 
@@ -337,10 +337,4 @@ describe('state', function() {
 </pre>
 
 
-## Related Topics
-
-* {@link dev_guide.mvc About MVC in Angular}
-* {@link dev_guide.mvc.understanding_model Understanding the Model Component}
-* {@link dev_guide.mvc.understanding_view Understanding the View Component}
-
 

docs/content/guide/dev_guide.mvc.understanding_controller.ngdoc renamed to docs/content/guide/controller.ngdoc

@@ -1,5 +1,5 @@
 @ngdoc overview
-@name Developer Guide: Templates: Data Binding in Angular
+@name Data Binding
 @description
 
 Data-binding in Angular web apps is the automatic synchronization of data between the model and view
@@ -35,4 +35,4 @@ isolation without the view and the related DOM/browser dependency.
 ## Related Topics
 
 * {@link scope Angular Scopes}
-* {@link dev_guide.templates Angular Templates}
+* {@link templates Angular Templates}

docs/content/guide/dev_guide.templates.databinding.ngdoc renamed to docs/content/guide/databinding.ngdoc

@@ -13,7 +13,7 @@ Angular sets these CSS classes. It is up to your application to provide useful s
 
 * `ng-binding`
   - **Usage:** angular applies this class to any element that is attached to a data binding, via `ng-bind` or
-    {{}} curly braces, for example. (see {@link guide/dev_guide.templates.databinding databinding} guide)
+    {{}} curly braces, for example. (see {@link guide/databinding databinding} guide)
 
 * `ng-invalid`, `ng-valid`
   - **Usage:** angular applies this class to an input widget element if that element's input does
@@ -27,5 +27,5 @@ Angular sets these CSS classes. It is up to your application to provide useful s
 
 ## Related Topics
 
-* {@link dev_guide.templates Angular Templates}
+* {@link templates Angular Templates}
 * {@link forms Angular Forms}

docs/content/guide/dev_guide.mvc.ngdoc

@@ -47,6 +47,8 @@ is simply handed the `greeter` at runtime.
 This is desirable, but it puts the responsibility of getting hold of the dependency on the
 code that constructs `SomeClass`.
 
+<img class="pull-right" style="padding-left: 3em; padding-bottom: 1em;" src="img/guide/concepts-module-injector.png">
+
 To manage the responsibility of dependency creation, each Angular application has an {@link
 api/angular.injector injector}. The injector is a service locator that is responsible for
 construction and lookup of dependencies.

docs/content/guide/dev_guide.mvc.understanding_model.ngdoc

@@ -6,9 +6,11 @@
 
 Everything you need to know about AngularJS
 
-## First steps
+* {@link guide/introduction What is AngularJS?}
 
-Just starting with Angular?  These links will give you a solid foundation to start building apps.
+* {@link guide/concepts Conceptual Overview}
+
+## Tutorials
 
 * {@link tutorial/index Official AngularJS Tutorial}
 
@@ -26,7 +28,7 @@ Just starting with Angular?  These links will give you a solid foundation to sta
 
 In Angular applications, you move the job of filling page templates with data from the server to the client.  The result is a system better structured for dynamic page updates.  Below are the core features you'll use.
 
-* {@link guide/dev_guide.templates.databinding Data binding}
+* {@link guide/databinding Data binding}
 
 * {@link guide/expression Expressions}
 
@@ -42,8 +44,6 @@ In Angular applications, you move the job of filling page templates with data fr
 
 * **Blog post: **[When to use directives, controllers or services](http://kirkbushell.me/when-to-use-directives-controllers-or-services-in-angular/)
 
-* **Separation of concerns:** {@link guide/dev_guide.mvc Model-View-Controller}
-
 * **App wiring:** {@link guide/di Dependency injection}
 
 * **Exposing model to templates:** {@link guide/scope Scopes}