Draft of OrderParameter wrapper for general fcns.
Initial commit of test directory.
Generic order parameter wrapper. Also, tests.

Getting a trajectory into the test ended up being the hard part.
Finished correcting psi/phi mixup.
added Davids tests
Merge branch 'dihedral_op' of github.com:dwhswenson/msm-tis

Conflicts:
	code/python/PySRMSTIS/src/orderparameter.py
Merge pull request #22 from jhprinz/master

Added Davids Dihedral feature from #20