-Added welcome screens
-Added support for connecting to facebook and getting user's name and email, using a lightweight plugin.
-Added inappbrowser cordova plugin for fb auth
(TODO): the $cordovaNetwork.isOffline() call results in an error being thrown by the ngCordova plugin when app is started on an android device. Could be plugin bug, should be revisited. Temporary fix: bypass the plugin and do isOffline check ourselves.
-Added a 'preen' section to bower.json to indicate which library files we want to keep. Running preen with this change will clean up the library folders, bringing the final app pacakge down to a third of it's original size.
-Changes to .gitignore to stop tracking local.properties files.
Merge remote-tracking branch 'origin/master'