Add sinatra template helpers

The RUM was only supported in Rails.  I added it for Sinatra.  When rendering a template in Sinatra, it uses the Application context by default, so anything included is callable in the templates.

I use the same JS files, but had to ever so slightly change the method calls since `raw` isn't a method under Sinatra.

The JS files could probably be moved around since they really don't have a dependency on Rails.