Merge pull request #6 from blandry/master

trim condition minimizes dz/dx
Added anatomically correct model
URDF version 12

Need to still modify pigeon_12 URDF ... I'm just commiting to pass
between OSes here.
Pigeon 12 is now fully working with new dimensions, and the findTrim function works with it (I modified the dimensions of the arrays to make them match)
got runDihedral and runFlapping to work with new pigeon model
Textured Pigeon

Added textures to Solidworks files and added legs. Will be exporting to
URDF as soon as I can figure out how to get the textures to export along
with it.
Added minor updates to anatomy of tail
Began process of creating textured .dae files.
Continuing work on dae exporting with textures
Completed exporting of textured .dae files. Pat Marion is going to run them through a script he has so that they can work in drake.
Fixed mass of legs
flapping traj opt