Add class to manage a list of unique names and create indexes for them.
Add tests for unique names
Initial framework for hierarchy builder. Needs DirectedEdge and
EdgeInfo attribution to go much further.
Don't want this file
Merge remote-tracking branch 'origin/master' into dwn
Updates to directed edge forces updates to the builder
Merge pull request #8 from valhalla/dwn

Add class to manage a list of unique names and create indexes for them.