First Commit From Dave

Ahoy :)
I played around with your code and made a few modifications and thought I would submit a pull request just in case you would be interested in merging in the changes.

Changes in this commit:
 * Hid the titlebar
 * Removed unused imports
 * Hide the keyboard on button press
 * Logs in with signature token instead of username & password
 * Begun working on having it log in with the MD5 & timestamp
 * Doesn't change the button if an error was returned
 * After checking the API return for a valid HTTP statusCode check to see if yourls returned an error
 * Added myself to the credits :)