Bump version
raise ResponseError if an empty list is passed to SADD
rename and renamenx support
Added py33 & py34 to .travis.yml and tox.ini. Updated README with supported python versions.
Merge pull request #64 from Grokzen/py33py34

Added py33 & py34 to .travis.yml and tox.ini. Updated README with suppor...
Merge branch 'feature/sadd_error' of git://github.com/asherf/mockredis into asherf-feature/sadd_error
Merge branch 'asherf-feature/sadd_error' into develop
Merge branch 'develop' of git://github.com/jgargallo/mockredis into jgargallo-develop

Conflicts:
	CHANGES.md
Merge branch 'jgargallo-develop' into develop
Add return values
Merge branch 'release/2.9.0.9'