log addition of relationships to debug only
add toString() for BomRelationship

Conflicts:
	relationships-api/src/main/java/org/commonjava/maven/atlas/graph/rel/BomRelationship.java
make sure that graph paths terminating at the root node have that in the start node, at least...even if they don't have any relationships, which will still allow them to give useful information about the target of the path.

Conflicts:
	drivers/neo4j-embedded/src/main/java/org/commonjava/maven/atlas/graph/spi/neo4j/FileNeo4JGraphConnection.java
	drivers/neo4j-embedded/src/main/java/org/commonjava/maven/atlas/graph/spi/neo4j/traverse/AtlasCollector.java
	relationships-api/src/main/java/org/commonjava/maven/atlas/graph/EGraphManager.java
	tck/src/main/java/org/commonjava/maven/atlas/tck/graph/traverse/AncestryTraversalTCK.java