fix($templateRequest): cache downloaded templates as strings

Fixes angular#10630
Closes angular#10646

Author: pkozlowski-opensource

src/ng/templateRequest.js

@@ -44,6 +44,7 @@ function $TemplateRequestProvider() {
           handleRequestFn.totalPendingRequests--;
         })
         .then(function(response) {
+          $templateCache.put(tpl, response.data);
           return response.data;
         }, handleError);
 

test/ng/templateRequestSpec.js

@@ -17,7 +17,7 @@ describe('$templateRequest', function() {
   }));
 
   it('should cache the request to prevent extra downloads',
-    inject(function($rootScope, $templateRequest, $httpBackend) {
+    inject(function($rootScope, $templateRequest, $templateCache, $httpBackend) {
 
     $httpBackend.expectGET('tpl.html').respond('matias');
 
@@ -34,6 +34,7 @@ describe('$templateRequest', function() {
 
     expect(content[0]).toBe('matias');
     expect(content[1]).toBe('matias');
+    expect($templateCache.get('tpl.html')).toBe('matias');
   }));
 
   it('should throw an error when the template is not found',