Bumping rspec-rails to 2.14.x

Taking a screenshot on failure.

Fixing acceptance tests broken by Paypal flow changes.

Conflicts:
	spec/features/paypal_spec.rb

Automatically re-run failed specs.

This change automatically re-run failed specs. The Paypal gateway has the
bad habit to return server errors at times. The result is a potential false
negative. Re-running the failed spec(s) gives the suite a chance to succeed.