Bring fcrepo4-labs fork in line with acoburn/fcrepo-camel

This brings the repo in line with acoburn/fcrepo-camel, including several earlier pull requests. It addresses the following pivotal stories:

https://www.pivotaltracker.com/s/projects/684825/stories/82226136
https://www.pivotaltracker.com/s/projects/684825/stories/82225718
https://www.pivotaltracker.com/s/projects/684825/stories/82226486