add push and pop methods

exposes functionality so that loading bar progress can be customized more easily
added unit tests for this new functionlity
added push and pop functionality to the description of the service API in the readme
added setting autoIncrement to the configuration section of the readme

Author: ArlyMathiasen

README.md

@@ -152,7 +152,15 @@ $http.post('/save', data, {
 
 ```
 
+#### Auto Increment 
+By default, the loading bar will increment by a random amount that get's smaller as the bar fills, you can disable this: 
 
+```js
+angular.module('myApp', ['angular-loading-bar'])
+  .config(['cfpLoadingBarProvider', function(cfpLoadingBarProvider) {
+    cfpLoadingBarProvider.autoIncrement = false;
+  }])
+```
 
 
 ## How it works:
@@ -190,7 +198,17 @@ cfpLoadingBar.status() // Returns the loading bar's progress.
 
 cfpLoadingBar.complete()
 // Set the loading bar's progress to 100%, and then remove it from the DOM.
-
+//
+// Alternatively, you can us push() and pop() to control the loading bar
+// It is suggested that you turn off autoIncrement if you plan on using this
+cfpLoadingBar.push(x)
+// starts the loading bar if it hasn't been already, and adds to number of 'requests' for this loading bar
+// it will broadcast x on the 'cfpLoadingBar:loading' event when called
+cfpLoadingBar.pop(y)
+// increments the number of requests that have been completed
+// then, if the number of 'requests completed' is greater or equal to the number of 'requests' on this bar, it calls complete 
+// and broadcasts y on the 'cfpLoadingBar:loaded' event
+// otherwise, it sets the bar's progress to the number of 'requests completed' divided by the number of 'requests' on this loading bar
 ```
 
 ## Events