Sets ruby version (2.1.4) to match version supported on target debian system; Modernizes use of spec/rails_helper and spec/spec_helper
Fixes all rspec tests to pass with blacklight 5
- Some Blacklight Features have deprecation horizon for blacklight 6.0.  Must refactor to stop using them.
- RSpec tests must be rewritten to use expect() syntax instead of .should and .stub
- "BIG DEPRECATION WARNING" from Guard must be addressed