fix natural key bugs and create starters.json fixture
Merge branch 'master' of git@github.com:valnet/valuenetwork
add explore template so Lynn can experiment with it
Merge branch 'master' of git@github.com:valnet/valuenetwork
Exchanges: supplier and context agent done, except default supplier.  Still need event agents.
Merge branch 'agent' of https://github.com/valnet/valuenetwork.git into agent
Merge branch 'master' of https://github.com/valnet/valuenetwork.git into agent