Add Support for Teaspoon Runner

Teaspoon is a javascript test runner for rails apps which uses the asset
pipeline to manage dependencies.

https://github.com/modeset/teaspoon

It can be run in either CLI or the Browser.  Now you can run your javascript
tests directly from the comfort of Vim just like Rspec, Test::Unit, or Cucumber
Merge pull request #33 from stephenprater/add_teaspoon_support

Add Support for Teaspoon Runner