Merge pull request #14 from lyg830/master

a camera bug fixed
added progress spinner as photos load
Fixed mainactivity problem that crashed if mainfragment became detatched. Began login implementation
Flickr login working...backend only, not reflected in app
Flickr Login working. Updates username in settings fragment.
Updated visuals for settings view
added upload skeleton. Changed flickr object access to use shared instance in MainActivity
Uploading photos of llamas!
Code cleanup, documentation
misc code cleanup