height map terrain uses barycentric code.  working on integration with viewer, by writing obj files
littledog terrain demos work
updated terrain test examples in drake.  they look pretty cool now.  (but won't actually work in vrml for the moment)
fixed typo in flat terrain
cleans up obj and wrl file writing.  resolves #440 - except the normals are still pointing the wrong way
fix vrml terrain color.  giving up on normals for now.  the viewer doesn't seem to accept anything.
pulls writeOBJ out of RigidBodyHeightMap per Andres' request
Merge pull request #439 from RussTedrake/terrain

Major cleanup / update to RigidBodyHeightMapTerrain