Messaging features and "easy" change settings

Added methods for mailbox features and send/recieve messages
SettingsManager as wrapper for FirebaseManager changeSettings method.
Add SettingsManager file
Merge branch 'develop' of https://github.com/CS180Fall2014/UcrRunner into develop

Conflicts:
	app/src/main/java/com/murraycole/ucrrunner/backend/FirebaseManager.java
	app/src/main/java/com/murraycole/ucrrunner/view/adapters/MessagesAdapter.java
Merge branch 'develop' of https://github.com/CS180Fall2014/UcrRunner into develop