add methods to Commitment: commitment_type associated_wanting_commitments associated_producing_commitments
add methods to Commitment:
commitment_type
associated_wanting_commitments
associated_producing_commitments

thierrymarianne/valuenetwork,FreedomCoop/valuenetwork,simontegg/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp,simontegg/valuenetwork,django-rea/nrp,django-rea/nrp,valnet/valuenetwork,simontegg/valuenetwork,valnet/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,thierrymarianne/valuenetwork,valnet/valuenetwork,simontegg/valuenetwork,thierrymarianne/valuenetwork,django-rea/nrp,thierrymarianne/valuenetwork,FreedomCoop/valuenetwork