Merge pull request #1010 from pulp/jcline-1094264

1094264 - Retrieving bindings by consumer and repository now returns 404 if the consumer or repository ids are invalid.
Merge pull request #1012 from pulp/jcline-1094286

1094286 - failing to include 'options' or 'units' during content calls on consumers now causes a 400 code
Merge pull request #1009 from pulp/jcline-1060866

1060866 - The Repository Group Distributors API is now documented
1109430 - goferd supporting systemd.
Update docs goferd (instead of pulp-agent) and add systemd examples for goferd.
Automatic commit of package [gofer] minor release [1.3.0-1].
Merge branch 'jortel-1109430'