In progress

Describe table  in progress.
Describe, Delete table API implemented
Fixed TableDelete test

Code polishing
Allow new features with tox v1.6
Reasons:
 - tox update v1.6
Changes:
 - tox 1.6 allows us to skip the sdist step, which is slow.
 - It also allows us to override the install line. In this case, it's
   important as it allows us to stop getting pre-release software we
   weren't asking for.

Original patch by Monty Taylor, talked about here:
http://lists.openstack.org/pipermail/openstack-dev/2013-September/015495.html
Cassandra backend: select item
Cassandra backend: select item with conditions on indexed fields
Added 'system_hash' field
Merge pull request #24 from ikhudoshyn/cassandra-select-item

Cassandra select item
Merge pull request #23 from denismakogon/tox16

Allow new features with tox v1.6
Moved responce formatting to action class. PEP8 fixes
Removed mock, mox3 from dependencies. Code polishing
Merge pull request #22 from zaletniy/api

Implemented TableDelete, TableDescribe API