bugfix in trajectory.restrict_atoms where the array was not being stored in memory correctly, and so when the trajectory was centered in c-land it was not centered correctly.
added mode='c' to _center_inplace_atom_major declaration to be sure that array to be centered is contiguous in memory
Merge branch 'master' of github.com:rmcgibbo/mdtraj into centering
added test for this bug in test_trajectory.py
added a centering test that also restricted atom indices
Merge pull request #295 from schwancr/centering

bug in trajectory.restrict_atoms