Support CVS generation

Extend bundles class to store activities names.

Add a new helper script to output, in CVS format, the list
of activities bundle_id and names.

Update README with instructions.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Release 0.0.8

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>