Factored Activity into Fragments

Changed Activity logic to deal with adding and replacing fragments. In
doing so, adding the following fragments: HomescreenFragment,
WebsiteListingFragment, and WebViewFragment. WebViewFragment could use
some work to allow web navigation (back, forward, refresh). Fragment
navigation has a few small bugs
Strange error in git syncing

Had to delete this file for some reason or another, replacing it back
into the ABS library