Bumped cassandra to version 1.2

KassandraMRHelper is now backwards compatible up to and
including 1.2.

Added a BackwardsCompatibleDescriptor

updated yaml file and tests
Don't need jukito

Don't need jukito as a dependency
Cleaned up conf files a bit, removed extra deps.

Removed guice.
Cleaned up yaml conf
Merge pull request #2 from gneokleo/master

Bumped cassandra to version 1.2