Added support for the CoffeeReactTransform

With some inspiration from @leyyinad ( c7cafb1fa857b30d67c8c8ed63f406556fb6005e ), I created this really simple pull request to add optional cjsx support. There are some issues where I want to have feedback on:

- config only supports options from rules, no 'global' rules, how should i fix this? (currently using `userConfig` as a workaround)
- this is really cjsx specific, maybe a transform option where you can specify different transformers? 
- the `CoffeeReactTransform` never throws an error it just doesn't compile if it isn't recognized as valid cjsx
- are there any chances this could get merged?