Added language to shell examples
Updated utils module
Added dev option
Separated templating

Templating functions are now separated in it's own module. Several
defaults concerning templates have also been moved to this module.

CSS stylesheets have been added, providing the possibility to have
separate stylesheets from the template file. This is not yet exposed
through the cli module.

The stylesheets are gathered, concatenated and minified before being
presented to the template. As a result the clean-css dependency has been
introduced.