Login Screen Created

** Pre-alpha background DO NOT LAUGH AT MY BACKGROUND FOR LOGIN SCREEN
:(((((( **
*activity_login.xml is created for login screen and is now linked when
you press login from activity_main.xml

*activity_login.xml now links you to activity_test.xml when pressed
"Login" button, so the test was pushed by one and you can find its
source from LoginActivity's onClicked(View v) method.

*strings.xml has been modified adding two new strings to support
activity_login.xml.

*coin_bg.png is the current background for the activity_login.xml,
placed in drawable-mdpi.

*MainActivity  has been changed with the onClicked method to transfer
you to the LoginActivity

*I've tested it and everything is working fine, the login screen will
look a little weird on a few devices. The nexus gives the ideal screen.