Merge pull request #19 from insequent/master

More violation fixes for flake8
Added super calls to __call__ for RM6914
Merge pull request #20 from roaet/super_calls_to_call

Added super calls to __call__ for RM6914
Added basic runtime override support for waffles

Version updated to 0.1.2

Removed unnecessary _override
Merge pull request #22 from roaet/basic_override_support

Added basic runtime override support for waffles
Collected works of Nova_Callback

This is the squashed version and possiby end result of the
    Nova Callback Filter.

Internally known as RM5109