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.
Merge branch 'master' of github.com:phlipper/chef-percona
Bumped version
Moved to using the service to stop mysql before configuring.
reverted cookbook/package versions, renamed use_percona_apt attribute
Fixed readme spacing
Merge branch 'master' of https://github.com/tkuhlman/chef-percona