Added new module to support LXC containers

The new module will allow users to control LXC containers from ansible. 
The module was built for use in LXC 1.0 or greater and implements most 
of what can be done using the ``lxc-* `` clients.

The module provides:
  * build containers
  * destroy containers
  * archive containers
  * list all containers
  * info from a single container
  * clone a container locally
  * start / stop / restart containers
  * run commands within containers
  * add/modify lxc config for a container
  * module supports multiple backends including LVM