add suggestion of c extension in composer
Merge pull request #123 from ricardclau/suggest_thrift

add suggestion of c extension in composer
Fix CfMutator inheritance of AbstractMutator

Instead of maintaining an Mutator instance as an internal
attribute, CfMutator now properly extend AbstractMutator. As
part of this work, the common logic in insert() and remove() was
moved to protected functions in AbstractMutator.

Fixes #122
Add VERSION file
Disable Super CF composite test due to CASSANDRA-5287

Once this is fixed and TravisCI has the latest version of Cassandra,
the test can be restored.
Fix key_start, key_finish types in get_range docstrings
Use batch mutations for remove() on counter CFs

Cassandra accepts batch mutations to remove all counters
from a row, but doesn't accept calls to the normal remove()
method on counter CFs.
Merge remote-tracking branch 'upstream/master'