The RSpec/FilePath cop checks that a spec file's path is correct, but
only if the file describes a constant. We want to check, for any file
with a top-level `describe`, whether the file path ends in
`_spec.rb`. We don't care what comes before that; just that it will be
executed by RSpec at all.
Replaces all the explicit include metadata syntax in the specs (tag:
true) into the implicit one (:tag).
Added a cop to prevent future errors and handle autocorrection.
Sean McGivern