Added cluster package attribute, apt attribute and undeprecated cluster

The apt attribute allows skipping the percona apt setup. Useful for
environments where there is not outside internet access and all apt
packages are via local mirrors.
Fixed an issue with failure to restart mysql on initial provisioning.
Bumped version
Moved to using the service to stop mysql before configuring.
reverted cookbook/package versions, renamed use_percona_apt attribute
Fixed readme spacing
style cleanup
add contribution from @tkuhlman to the README
Merge pull request #134 from phlipper/cluster-support

Cluster support

closes #119