Changes:
	Changes to layout for Signup:
	       Made password field replace characters with dots
	       Made confirm password field with same settings as password
	       Hitting enter while in username goes to password
	       Hitting enter while in password close text dialog
	       Change layout format from relative to vertical
	       Made all text fields' width fill parents
	Changes to layout for Login:
	       Made password field replace characters with dots
	       Add remember password checkbox (not functional at the moment)
	       Made all text fields' width fill parents
	Changes to code for MainMenu.java
	       Made welcome message use the username or display no name if username is not entered
	       Change layout format from relative to vertical
	Misc. Changes:
		Added strings to strings.xml