webhooks: give full color group data in body
notify action: make color group top level data
notify action: use color_descriptor to build req body
extract webhook code to separate module
remove unused `as_dict` on Token
Merge pull request #18 from mark-burnett/expand-webhook-body

webhooks: give full color group data in body
add create-color-group action
petri split uses color_group.color_iter
Color{Group,Descriptor} have as_dict property
make webhooks.send_webhook more flexible
create-color-group action uses webhooks.send_webhook