Merge pull request #6 from Xeno-Genesis/master

Corrections in documentation
Using the new opPushData function for building optimized OP_PUSHDATA operators
Removing AUTHORS file
Labels for Address type changed
Moving liftEither and liftMaybe to Network.Haskoin.Util
Moving Persistent instances to Network.Haskoin.Util
BIP-0039 support (unit tests broken for now!)