Removed a deprecated call
ObjectConverter isn't public anymore

Hence breaking the public API.
However, because of its methods visibiliy, it's not worth going though a
deprecating phrase first.
Added finals
Removed constructor with an XMLRPCClient

to avoid having a public API being to tied to our implementation
Reorder constructors order

to allow a more top to bottom reading
Minor refactoring of Locker

* Smaller methods
* Ease top to bottom reading
Refactored a bit T_Attacher
Refactored T_Exception
Reduced verbosity extending TestHelper
Refactored TestHelper to have a more top to bottom reading
Minor refactoring
Adapted test for Weatherwax
Merge branch 'refactoring'
Updated README