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

@@ -303,6 +303,7 @@ describe('$sniffer', function() {
       });
       inject(function($sniffer) {
         expect($sniffer.transitions).toBe(true);
+        expect($sniffer.android).toBe(2);
       });
     });