Updated the environment API to support lazy and egraph planners. Added a LazyARA* planner.
Merge pull request #21 from robotman0/dev

Updated the environment API to support lazy and egraph planners. Added LazyARA*.
Bug fix in LazyARA. It also now fully supports the planner API.
Merge pull request #22 from robotman0/dev

Bug fix in LazyARA. It also now fully supports the planner API.
Merge pull request #23 from sbpl/master

Merge of master into dev
Merge pull request #24 from sbpl/dev

Merge of dev into master