Fix controller pattern matching, add test coverage

* Update pattern matching for controllers to catch application_controller.rb
* Add _controller to existing patterns
* Add tests for other pattern matching methods
Update test name, add extra specs to find_order

* Changed test name based on feedback:
  https://github.com/rspec/rspec-autotest/pull/17/files#r15969175
* Added additional spec to .find_order
Allow for unconventionally named controller spec to be matched
Revert pattern matching for controllers

* Only guard for `application_controller`, match on anything else.
Merge pull request #17 from sgerrand/rails-controller-pattern-matching

Fixes controller pattern matching, add test coverage