* Adds BuildLineLabel model
- New type of label for printing against BuildLine objects
* Add serializer for new model
* Add API endpoints for new label type
* Add hooks to BuildLine table
* Create default label
- Create an example BuildLineLabel object
* Add admin integration
* Fix js code
* Use two-tiered template
- Allows base template to be updated
* Improve default label
* Add docs pages for labels
* Update nav
* Documentation for new label
* Add permission role
* Bump API version
