Android 5 support and bug fixes

1. upgrade the compile target  SDK version from 20 to 21
2. Added static function capture the user from server
3. Fixed an compile error 
4. Fixed the update profile activity landscape mode. 
5. Added fetch capture user to the Sample App. 
I think that deleting all cookies here could cause issue for customer applications that use web views for other purposes. Instead ensure that the logic in WebViewUtils is actually deleting all the cookies for the given domains for a given provider. Twitter is working in iOS, so I assume that the issue has to do with the way we attempt to delete cookies for a provider.