WAUTH-2 initial commit

Implemented WAUTH-2 mechanism (still not working though)
Added new Token dictionaries
Login now working

But still some internal reading troubles
Merge pull request #226 from CODeRUS/wauth2

Login now working
Reading incoming data now working

Fixed decoding message
Updated outgoing message type to text
Send is still not working (encoding problem?)
WA1.4 nodes and functions implementation
Simple clientconfig.

We have no push services in 3rd party clients, so we can remove all
these parameters and use default ones.
Fixed encoding, now working prototype
Uppercase boolean expressions
Merge pull request #1 from luislezcair/wauth2

Uppercase (false -> False)
Merge branch 'master' into wauth2
Merge branch 'wauth2' of https://github.com/CODeRUS/yowsup into wauth2

Conflicts:
	src/Yowsup/Common/constants.py
Fixed cleanDirty signal