fix(core): remove angular.lowercase/uppercase

These functions have been deprecated since 1.5.0. They are internally
used, but should not be exposed as it's possible that they do not
work correctly with all locales (e.g. Turkish). It makes more
sense that developers use special purpose functions if they need to.

Author: Narretz

src/Angular.js

@@ -126,38 +126,22 @@ var VALIDITY_STATE_PROPERTY = 'validity';
 var hasOwnProperty = Object.prototype.hasOwnProperty;
 
 /**
- * @ngdoc function
- * @name angular.lowercase
- * @module ng
- * @kind function
- *
- * @deprecated
- * sinceVersion="1.5.0"
- * removeVersion="1.7.0"
- * Use [String.prototype.toLowerCase](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase) instead.
+ * @private
  *
  * @description Converts the specified string to lowercase.
  * @param {string} string String to be converted to lowercase.
  * @returns {string} Lowercased string.
  */
-var lowercase = function(string) {return isString(string) ? string.toLowerCase() : string;};
+function lowercase(string) {return isString(string) ? string.toLowerCase() : string;};
 
 /**
- * @ngdoc function
- * @name angular.uppercase
- * @module ng
- * @kind function
- *
- * @deprecated
- * sinceVersion="1.5.0"
- * removeVersion="1.7.0"
- * Use [String.prototype.toUpperCase](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase) instead.
+ * @private
  *
  * @description Converts the specified string to uppercase.
  * @param {string} string String to be converted to uppercase.
  * @returns {string} Uppercased string.
  */
-var uppercase = function(string) {return isString(string) ? string.toUpperCase() : string;};
+function uppercase(string) {return isString(string) ? string.toUpperCase() : string;};
 
 
 var manualLowercase = function(s) {

src/AngularPublic.js

@@ -149,8 +149,6 @@ function publishExternalAPI(angular) {
     'isArray': isArray,
     'version': version,
     'isDate': isDate,
-    'lowercase': lowercase,
-    'uppercase': uppercase,
     'callbacks': {$$counter: 0},
     'getTestability': getTestability,
     'reloadWithDebugInfo': reloadWithDebugInfo,