feat(docs): Add Improve this doc link in each doc page, which links to the edit mode of that file in github

Author: shyamseshadri

docs/src/gen-docs.js

@@ -32,7 +32,7 @@ writer.makeDir('build/docs/', true).then(function() {
   });
 }).then(function printStats() {
   console.log('DONE. Generated ' + docs.length + ' pages in ' + (now()-start) + 'ms.' );
-}).done();
+});
 
 
 function writeTheRest(writesFuture) {

docs/src/ngdoc.js

@@ -272,8 +272,9 @@ Doc.prototype = {
       self = this;
 
     dom.h(title(this.name), function() {
-      notice('deprecated', 'Deprecated API', self.deprecated);
 
+      notice('deprecated', 'Deprecated API', self.deprecated);
+      dom.tag('a', {href: 'http://github.com/angular/angular.js/edit/master/' + self.file, class: 'improve-docs btn btn-primary'}, 'Improve this doc');
       if (self.ngdoc != 'overview') {
         dom.h('Description', self.description, dom.html);
       }

docs/src/templates/css/docs.css

@@ -86,6 +86,10 @@ img.AngularJS-small {
 /*            Content              */
 /* =============================== */
 
+.improve-docs {
+  float: right;
+}
+
 .hint {
   font-size: .7em;
   color: #c0c0c0;