Adds ripple effect to adapter background
Authentication is now possible without server interaction

Dao was modified to accept credentials without contacting the server.
Therefore the app can be started without beeing connected to the
internet (no initial signin required).
Adds parser, dao and tests for bookmark resources

Also changed XmlParserUtil class to be more generic and adapted existing
parsers accordingly.
Fixed typo in event xml test files.
Adds bookmark service and listeners

Modified module classes to instantiate the new bookmark service
properly.
Also added simple listener implementation for event service callbacks
and adapted EventsFragment to use this new listener class.
Adds method to check if certain publisher are currently being updated
Adds bookmarks fragment, adapter and resources
Renames EventsActivity to MainActivity

This activity will now be used to display most of the fragments
selectable from the navigation drawer.
Replaces bookmarks icons and adds padding to bookmarks adapter layout