updated docstring for ApiError exception
Renamed genericWord to Genericword.
GenericWord now inherite from str.
fixed inheritance
removed constructor
removed some prototype comments
updated docs
added ConnClosed exception
RwError
 removed contructor
 updated docs

added new RwTimeout exception
fixed inheritance
removed constructor
fixed inheritance and changed name of class
renamed class name
renamed class names and fixed inheritance
removed unused prototypes
updated docs
updated mapping
removed tag properties from sentences objects
tags can not be added to sentences
self._words is list() not set()
renamed value caster classes
added and updated methods in ApiSocketDriver
removed dependeny on sentence and word objects.
removed __repr__
updated docs