Upgrade to RSpec 3

Use the latest and greatest in testing technology.

Change-Id: I811a152bde8e049c001cf29c93522feb3961f7c0
Reviewed-on: http://gerrit.causes.com/40432
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>
Fix Rubocop path deprecation warnings

Change-Id: I1b94589caae9a9400b409018f96be088446baadf
Reviewed-on: http://gerrit.causes.com/40433
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>