Cleanup of Login Screen and Created new Settings screen

Made the login page look pretty in both landscape and portrait on both iPad and non-iPad screens. 

Position the logo and login container (the container includes the user name and pwd text boxes and the login button) in resolution independent way. The logo and login container's places are swapped when the keyboard is revealed to ensure the login container isn't covered by the keyboard - nice as it work on non-iPads in landscape really well. The logo is also scaled down on non-iPads when rotated to landscape. All of these movements and scaling are animated smoothly.

Also added loading indicator (spinning wheel) which appears when login button is pushed.