chore($sniffer): make android variable public

Author: clkao

src/ng/sniffer.js

@@ -85,6 +85,7 @@ function $SnifferProvider() {
       vendorPrefix: vendorPrefix,
       transitions : transitions,
       animations : animations,
+      android: android,
       msie : msie,
       msieDocumentMode: documentMode
     };

test/ng/snifferSpec.js

@@ -334,6 +334,21 @@ describe('$sniffer', function() {
     });
   });
 
+  it('should provide the android version', function() {
+    module(function($provide) {
+      var win = {
+        navigator: {
+          userAgent: 'android 2'
+        }
+      };
+      $provide.value('$document', jqLite({}));
+      $provide.value('$window', win);
+    });
+    inject(function($sniffer) {
+      expect($sniffer.android).toBe(2);
+    });
+  });
+
   it('should return the internal msie flag', inject(function($sniffer) {
     expect(isNaN($sniffer.msie)).toBe(isNaN(msie));
     if (msie) {