Fix Issue #16, broken TCPDriver MRO

The TCPDriver was raising a ``NotImplemented``
exception whenever ``raw_send`` or ``raw_recv``
were called, directly or indirectly. This was
caused by an improper placement of ``TextualMixin``
in the Method Resolution Order. Essentially, the
abstract versions of methods were overriding the
concrete implementations.
Merge pull request #17 from sfinucane/develop

Fix Issue #16, broken TCPDriver MRO
Merge branch 'develop' of github.com:hgrecco/lantz into develop
Refactored code to get feat docs
Started IEEE488.2 and SCPI base drivers
Add module level option to print traceback
Fixed named of Wrapper class and added attribute to mark it as Wrapper
When building a Test Panel, use directly the wrapper classes.
Fixed type checking for dictfeat
Removed old style signal connection.
Fixed signature in slots
Move detection of LANTZ wrapper widget to wrap method.
Added lantz.utils to setup.py