fix(refresher): Fix refreshing icon in Android 4.3 and lower
feat(clearCache): create $ionicHistory.clearCache()
fix(navDirection): use correct direction value
docs(): remove broken link in readme 

Closes #2487
chore($ionicSlideBoxDelegate): deprecated methods
fix(title): use defined viewTitle attrs
fix(delegates): find active instance
Merge branch 'master' into wip-scrolling