Added the login fragment.
Added the app_id string required for the Facebook login. Removed the facebook_login string (not necessary yet)
Added a reference to the FacebookSDK and the android-support-v4.jar library to the classpath.
Added an Internet permission. Added the app_id and the Facebook login activity to the manifest.
Added the custom Facebook login button instead of the android's default button.
Added code for setting the activity up to use the login fragment.