Bump version number.
Implement remaining set operations and clean up organization slightly.
Merge branch 'release/2.7.2.2' into develop
Implement SMOVE and multivalue SREM. Standardize on set(), not set([])
Merge branch 'feature/sets' into develop
Change distribution name to mockredispy
Update change log
Add pip install reference.
Merge branch 'release/2.7.2.3'