Updated docstring to superpose
Move atom indices code to Topology
Alpha carbons from proteins only
Residue identities
Fix to ppm chemical shift wrapper, better tests, CI integration.
Fixed provenance info for shiftx2 test
Change to is_water and add more residue name
Fixed PATH for shiftx2.py
Test for python 2.X before using shiftx2
Skip shiftx2 test on py3
Merge pull request #499 from kyleabeauchamp/aligned

Updated docstring to superpose?
rmcgibbo changes
Simple test
Contributors
Fix test
Punctuation
Forgot to move 'pairs' argument from docs
Merge pull request #500 from mpharrigan/atomindices

Select Atom Indices (by name) in mdtraj
Use shift2x tarball from cached site
Remove py3 test from shiftx2 wrapper