Added User authentication. Retrieving access token and storing locally.
Added a context param to the url construct methods so that the AuthToken can be retrieved.
CLicking on any venue in the app now goes to detail screen. This will load the name and address in the ActionBar and an image will display (moving this to a viewpager in the future.
Moved loading layout to baseframgnet. Added description to FsVenue item. It is now being displayed in the Detail fragment if present.