Add "wordpress" custom URL scheme, and new activity that handles the call.
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into feature/deep-linking-269
* Cleaned up deep-linking code
* First pass at requesting post from server when post detail sees it doesn't exist locally
Post is now correctly retrieved from server when it doesn't already exist in local db, also handling case where requesting post fails
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into feature/deep-linking-269
Deep-linking now works when user is logged out (app will wait for them to login before displaying the post)
Removed ToDo
Merge branch 'develop' into feature/deep-linking-269
remove a Twitter reference
Merge branch 'develop' into feature/deep-linking-269