Added builds/ to the gitignore.
Added command-line options to build-all.

They're hokey, but they work. Default is to do the
exact same stuff as before. Still need to add cleaning
operations, but we're doing that before each build, so
it should be safe for now.
Merge branch 'dev' of github.com:iPlantCollaborativeOpenSource/DiscoveryEnvironmentBackend into dev

Conflicts:
	.gitignore