Add Admin::Feedbacks#index
Extract Flash display to a partial
Extract Feedback partial
Whitespace
Add RagerCommunicator class

This is a class for demonstrating contrived unit
tests.  During live-coding we went from change
in situ in the view, extracted to helpers,
extracted to a class methods, extracted to this
presenter.
Remove Feedbacks#show
Remove default Rails rdoc file
Add informative DBC README.md