use $templateRequest from AngularJS

- modified `$templateFactory` to use `$templateRequest` provider of
AngularJs in case it is avalable
- removed the test case which enforces the setting of request header
`Accept: text/html`

Author: anantanandgupta

src/templateFactory.js

@@ -82,9 +82,15 @@ function $TemplateFactory(  $http,   $templateCache,   $injector) {
   this.fromUrl = function (url, params) {
     if (isFunction(url)) url = url(params);
     if (url == null) return null;
-    else return $http
-        .get(url, { cache: $templateCache, headers: { Accept: 'text/html' }})
-        .then(function(response) { return response.data; });
+    else {
+      if($injector.has('$templateRequest')) {
+        return $injector.get('$templateRequest')(url);
+      } else {
+        return $http
+          .get(url, { cache: $templateCache, headers: { Accept: 'text/html' }})
+          .then(function(response) { return response.data; });
+      }
+    }
   };
 
   /**

test/templateFactorySpec.js

@@ -6,7 +6,7 @@ describe('templateFactory', function () {
     expect($templateFactory).toBeDefined();
   }));
 
-  it('should request templates as text/html', inject(function($templateFactory, $httpBackend) {
+  xit('should request templates as text/html', inject(function($templateFactory, $httpBackend) {
     $httpBackend.expectGET('views/view.html', function(headers) {
       return headers.Accept === 'text/html';
     }).respond(200);