Use ghoneycutt/types for NFS mounts.

Instead of using create_resources() with the mount resource, we use the
types::mount resource. This class sets sane defaults as well as ensures
that the directory for the mount is present.
Add validation of ruby files to `rake validate` task
Use v1.0.0 of ghoneycutt/types
Add validation of templates to `rake validate` task
Merge pull request #16 from ghoneycutt/refactor_nfs_mounts

Refactor nfs mounts