Auto login, Account Settings page, Logout

Edited Files:
AccountSettingsActivity.java - Added checker for empty fields, passwords longer than 20, made Delete Account work, made Change Password work

CreateAccountActivity.java - Added checker for passwords longer than 20

LoginActivity.java - Auto login implemented, storing username, password, and login info in preferences of device.  Removed user remover stuff from this class.

SelectRoomActivity.java - Added menu for account settings and logout