#8213 - Convert protected_parent plugin to an in-house gem

This pull requests takes a fork of the protected_parent plugin and converts it to a gem structure with a slight modification to be used in house.  The slight modification is the introduction of using a globally set constant `PROTECTED_PARENT` to toggle the core functionality on/off. With that slight modification a test example was added to the existing spec to ensure its expected behavior.

This repo will be used via bundler and replace the lib/protected_parent.rb module and initializer.

[#8213](https://squaremouth.lighthouseapp.com/projects/63460/tickets/8213-convert-protected_parent-into-a-gem)