Misc changes

Hi,

I made some changes to the app:

20956fa - I fixed the project setup to work for me with the current fb api. You may skip that path.
19b9f9e - I resolved some Lint errors and made some minor clean ups to code and style.
57da73e - I switched back to Theme.Light / Theme.Holo.Light (depending on API), I find it more clean. You may want to skip it to keep your original custom design.
9dab8ed - I replaced some Thread.run() with AsyncTask.excecute() and put the former global dialog in the tasks itself. It's more within Android's guidelines now.
adf23c0 - I added the option to sync a single friend from friend list.
9cd1ad0 - I added the option to sync the profile picture, and not the largest one. It's deactivated by default.
f0a0756 - I changed the Main Activity to launch the FriendList if the facebook session is still valid.

I'd be happy, if you merge some of the patches (at least the last 3) into your master and release the app.

BTW: The Facebook API you are using is marked as deprecated now. But I'm not familiar with the old nor the new one..

Best regards,
Felix