Delegate compilation of SCSS file to Grunt.

The `config.rb` file was removed and its configuration were assigned
to the grunt compass task.
Configure application through modules.

Isolate all of the application configurations into their own
module, which are later required.

Also, restored `config.rb` file which seem to be needed for
grunt to require gems correctly, it seems the require option
is ignored.
Renamed handlebars template directories.
Render site header.