Some minor work.
Some WIP tutorial changes.
Dropbox SDK update.
Move API key to separate file.
Remove old, outdated update webpage
Update Dropbox SDK to 1.3.11.
Update with licensing information.

GPLv2 for code, CC Attribution-NonCommercial 4.0 International for assets.
Whoops, missed a spot.
README.
Fix build with latest cocoapods.
ASIHTTPRequest is dead, but get the latest anyway.

We should switch to one of:

 - MKNetworkKit: http://blog.mugunthkumar.com/products/ios-framework-introducing-mknetworkkit
 - AFNetworking: http://afnetworking.com/
Fix code signing, stomp some warnings.
Copy DropboxOSX in Setup bundle.