Support Ubuntu 18

v1.7.0

Update metadata and check command to allow it to work on Ubuntu 18

Update client service subscription to support later versions of Concat

Change service to subscribe to Concat resource

When updating concat module, subscribing to File no longer works, guessing because order of file generation changed.

Should really subscribe to Concat anyway, since File is an implementation detail from concat.

Update to dependencies and OS support

Update dependencies and OS

- Allow versions of concat module up to 4.9
- Add Ubuntu 16.04 to list of supported OS's

Updates to make Puppet 4 compatible

v1.4

Update file modes to puppet 4 compatible