describe open-spec command for controller
setup open-spec command
add rspec fixtures
implement open-spec when active editor is controller
describe open-spec command when current editor opens model
implement open-spec command for model
describe open-spec for helper
implement open-spec for helper
fix bug that controller detection was wrong
Merge pull request #12 from hmatsuda/open-spec-command

Closed #12 since open-spec command has been implemented by this PR.