Automatically trigger stemcell builds on changes to bosh-stemcell or stemcell_builder
Automatically trigger stemcell builds on changes to bosh-stemcell or stemcell_builder

[#134113675](https://www.pivotaltracker.com/story/show/134113675)

Signed-off-by: Rob Day-Reynolds <904086f049d807ae99640dbdfde98536a5822f56@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh