Added .gitignore file
Merge remote-tracking branch 'origin/master'
Added ABS support to ProGuard

Application was crashing on launch in beta. Needed to add an option to
ProGuard to keep all the ActionBarSherlock constructors, as suggested
here:
http://stackoverflow.com/questions/14111150/application-stopped-working-after-enabling-proguard.

Also made a quick fix to the dialog for categories in the
BookingHomeFragment, so that it's automatically closed when an item
is selected.
Added logging of requests and responses

Added log statements for request URL, request body, response code, and
response body.