fix($sniffer): report history false on Android < 4

Android has history.pushState, but it does not update the location correctly:
http://code.google.com/p/android/issues/detail?id=17471

Closes #904

src/ng/sniffer.js

@@ -14,10 +14,15 @@
  */
 function $SnifferProvider() {
   this.$get = ['$window', function($window) {
-    var eventSupport = {};
+    var eventSupport = {},
+        android = int((/android (\d+)/.exec(lowercase($window.navigator.userAgent)) || [])[1]);
 
     return {
-      history: !!($window.history && $window.history.pushState),
+      // Android has history.pushState, but it does not update location correctly
+      // so let's not use the history API at all.
+      // http://code.google.com/p/android/issues/detail?id=17471
+      // https://github.com/angular/angular.js/issues/904
+      history: !!($window.history && $window.history.pushState && !(android < 4)),
       hashchange: 'onhashchange' in $window &&
                   // IE8 compatible mode lies
                   (!$window.document.documentMode || $window.document.documentMode > 7),

test/ng/anchorScrollSpec.js

@@ -51,7 +51,8 @@ describe('$anchorScroll', function() {
     elmSpy = {};
     $provide.value('$window', {
       scrollTo: jasmine.createSpy('$window.scrollTo'),
-      document: document
+      document: document,
+      navigator: {}
     });
   }));
 

test/ng/logSpec.js

@@ -6,7 +6,7 @@ describe('$log', function() {
 
 
   beforeEach(module(function($provide){
-    $window = {};
+    $window = {navigator: {}};
     logger = '';
     log = function() { logger+= 'log;'; };
     warn = function() { logger+= 'warn;'; };

test/ng/snifferSpec.js

@@ -3,6 +3,7 @@
 describe('$sniffer', function() {
 
   function sniffer($window) {
+    $window.navigator = {};
     return new $SnifferProvider().$get[1]($window);
   }