Adding rspec framework.

Sponsored by Two Red Kites' first open source day!
Adding appraisals gem for testing against multiple versions of Rails.

Sponsored by Two Red Kites' first open source day!
Adding support for subclasses of RenderingController.

This allows for easier customisation of the RenderingController
for additional modules, helper methods, accessors, methods etc.

Sponsored by Two Red Kites' first open source day!
add syntax highlighting hints to readme
Merge pull request #19 from 2rk/master

Adding tests, appraisals and automatic detection of RenderingController subclasses.