added testprotocol.py and moved simple test case there
changed whatsapi.py to WhatsProt class
added _hexd, pbkdf2 functions and token dictionary to wa_functions.py
Added reader, writer and encoder classes to prepare for changes in whatsapi.py

Similar functionality to whatsprot.class.php's ProtocolNode, BinTreeNodeWriter,
BinTreeNodeReader and rc4.php's KeyStream
changed login and sendMessage functions in whatsapi.py

remember to set the device and whatsAppVer vars accordingly