Merge pull request #8 from gdchamal/master

force to use 2.0.10 version of cassandra. 2.1.2 did not work correctly
Merge pull request #9 from gdchamal/master

fix broken redis configuration
move web role variables to webservers groupvars
still an invalid configuration entry for redis
Merge pull request #11 from gdchamal/webvars

Webvars