(1) Added geometry import. (2) Added __hash__ and __eq__ for atoms. (3) Added read_arc functionality.
Merge branch 'master' of github.com:leeping/mdtraj
Oops, added arc.py now.
Added unit test for arc reader (check for equality to pdb)
Added a few docs for arc file.
Merge pull request #144 from leeping/master

A few small enhancements.