Rename methods to omit use of '$' (reserved for angular by convention)

Author: anantn

README.md

@@ -118,13 +118,13 @@ You can bind specific functions if you wish to add, remove or update objects in
 the collection with any Angular directive:
 
 ```html
-<form ng-submit="items.$add(item)">
+<form ng-submit="items.add(item)">
   <input type="text" ng-model="item.name" placeholder="Name" required/>
   <input type="text" ng-model="item.desc" placeholder="Description"/>
 </form>
 ```
 
-You can do the same with the `$remove` and `$update` methods.
+You can do the same with the `remove` and `update` methods.
 
 See the source for the
 [controller behind the demo chat app](https://github.com/firebase/angularFire/blob/gh-pages/examples/chat/app.js)

angularFire.js

@@ -170,15 +170,15 @@ angular.module('firebase').factory('angularFireCollection', function($timeout) {
       });
     });
 
-    collection.$add = function(item, cb) {
+    collection.add = function(item, cb) {
       collectionRef.push(item, cb ? cb : null);
     };
-    collection.$remove = function(itemOrId) {
+    collection.remove = function(itemOrId) {
       var item = angular.isString(itemOrId) ? collection[itemOrId] : itemOrId;
       item.$ref.remove();
     };
 
-    collection.$update = function(itemOrId) {
+    collection.update = function(itemOrId) {
       var item = angular.isString(itemOrId) ? collection[itemOrId] : itemOrId;
       var copy = {};
       angular.forEach(item, function(value, key) {

examples/chat/app.js

@@ -9,7 +9,7 @@ controller('Chat', ['$scope', '$timeout', 'angularFireCollection',
     });
     $scope.username = 'Guest' + Math.floor(Math.random()*101);
     $scope.addMessage = function() {
-      $scope.messages.$add({from: $scope.username, content: $scope.message}, function() {
+      $scope.messages.add({from: $scope.username, content: $scope.message}, function() {
         el.scrollTop = el.scrollHeight;
       });
       $scope.message = "";