:lipstick: Update grunt coffee version
Add oniguruma and cson module as dependencies
:fire: Remove grep option in prevision of a config
Implement a regexp based commits filtering

The rules for commits filtering are declared in a config file.
This config file can be either a JSON or a CSON file.
The `RegExp` syntax is provided with `node-noiguruma`.
Organize and render commits based on their matching section

The name of the config section that matched the commit is used as key
to stores the commits. Then in the rendering, a markdown list is
created for each key in the commits hash.