Remove unused variable.
Merge pull request #144 from leeping/master

A few small enhancements.
Update readme. Add mention of TINKER arc format (#144).
Add arc format  mention to docs (re: #144)
And mdcrd.
remove random obnoxious print statement that i probably inserted by accident
Update dihedral.py
Update angle.py
Update distance.py
added an example of calculating diheral angles from an OpenMM simulation
Added new examples that do clustering and PCA.
Update example_clustering.py
Update geometry.c
Fix license header
Added Kabsch-Sander Hbond computation
comment out random testing code. need to add a real test
fix linux specific (?) compilation error re casting
change way the tests are run from nosetests command line to python -c. will this fix import issue for libgeometry?
changes to init
Merge branch 'ks2' into kabsch-sander