update to work with new atlas/cartographer APIs post-cleanup. Remove filters that handled current workspace junk, now we're handling that during the operation itself.
don't use TreeSet for DTOs since it doesn't deserialize from a JSON array properly (gson problem, seems like). Also, minor cleanups and starting to explore API versioning via media type.
Merge branch 'atlas-api-cleanup'

Conflicts:
	addons/depgraph/common/src/main/java/org/commonjava/aprox/depgraph/discover/AproxProjectGraphDiscoverer.java
	pom.xml
upgrade to snapshot versions for atlas, cartographer, galley