Allow grunt 0.4 be installed

This might not be the cleanest solution as the API might break. At least
the plugin seems to work with 0.4 so I changed the version string to
allow larger versions than just 0.3.x.
Set up a small demo for testing
Allow dependencies to be defined

Note that I changed it to render using Handlebars. In addition the tool
now makes sure that globalAlias has been defined.