This gem adds `.haml` files to sprockets to precompile templates for opal. This

gem does not make the haml compiler available under opal, just the result of

pre-compiling a haml template.

A small runtime is included to handle dynamic attributes, as well as allowing

content to be rendered.

All haml templates become available under the `Template` constant in Opal,

which allows a template to be easily rendered in a context:

Template['user'].render(my_user)