Add jade as a devDependency.
Add support for the router dispatching with custom template extensions.
Implement vain.renderFileWith

The new method vain.renderFileWith allows you to run templates through
vain snippets after they have first been run through a different
processing engine. For an example, you can see us doing exactly that
with jade in our test of the renderFileWith method.
Update README for renderFileWith.
Support passing in a single string for view extensions.
Moar README updates for new API interfaces!
Merge pull request #13 from farmdawgnation/template-teamwork

Implement the ability to use vain with another template engine.