Merge pull request #25 from kmckiern/master

Fixed monomer behavior in liquid.py
Improved molecule.py and nifty.py (no inversion on align, _exec better)
Merge branch 'master' of github.com:leeping/forcebalance
Fixed crash with npt.py
Added a function to make AMOEBA forces work with virtual sites, improved Work Queue statistics.
Merge branch 'master' of https://github.com/leeping/forcebalance
Removed references to versioning file
Removed unnecessary "omp.h" include in assign.c
Skip OpenMP libraries when installing on Mac OS
If cannot import pkg_resources, use manually specified version number.
Added OpenMM's physical units library to package.
Improved molecule.py to read Q-Chem output better
Molecule parser now converts tabs to spaces before reading anything.  Code replication though...
Some expandtabs() were breaking the parser
Included switches for turning on/off maxopt in read_qcout.
Update tinkerio.py

Added line at 320
E = []
To define energy
Merge pull request #28 from mlaury/master

Update tinkerio.py
Moved AbInitio_GMX functionality into new GMX engine.
ITP reader skips preprocessor lines.
Merge branch 'master' of github.com:leeping/forcebalance into engine1