Creating a login screen

This is flow for the login screen based on what I did:
- The keyboard will be displayed when the user open the login screen and the focus will be on the first edit text box.
- The layout will adjust probably to display the login inputs based on the state of the soft keyboard. 
- Custom [Input Method Action](http://developer.android.com/training/keyboard-input/style.html#Action), to make it easier for the user to login without clicking the login button.
- Input validation