Merge pull request #4 from rmcgibbo/master

updates
Fixes for 528
Still not quite.
fixed viz update
Possibly fixed
Fix the random state in test_lprmsd.py
Don't index Pandas topology by serial.
Fix mol2 warnings
Added comment for openmm top
Don't set serial=index
Slightly looser tolerance, more robust
Un-commented check for uniqueness.
Merge pull request #581 from SimTk/mol2-warnings

Fix mol2 warnings
Add eq() check for roundtrip dataframe topology.
Merge pull request #579 from kyleabeauchamp/pdbfix

PDB Fixes for #528 (serial handling)
Default version on docs page
Mess with the constants
update
dont use underscore
Fix