Project-level testing.

Hello, I love emamux but ruby extension isn't such interesting as I expect. So I totally reengineer you extension with [projectile](https://github.com/bbatsov/projectile).

What's already implemented
* minor mode appropriate for ruby-mode-hook
* test whole project
* run test file from implementation or test itself
* load project repl

What will implemented as soon as I can
* send current method/class to [tconsole](https://github.com/commondream/tconsole)
* check current it/should/context with spork server

I thing that determine rspec version is a job for projectile. And I hope to fix this issue soon.