Merge pull request #491 from jchodera/fix-amoeba

Fix error in setting up AMOEBA systems when useDispersionCorrection is specified (retry)
Fixed a rare memory corruption error when roundoff causes tile indices to be wrong
Fixed some test failures
Merge pull request #495 from peastman/unsigned

Fixed a rare memory corruption error when roundoff causes tile indices to be wrong
Merge pull request #496 from peastman/master

Fixed some test failures
Commented out testEinsteinCrystal(), since it failed much too often
Merge pull request #497 from peastman/master

Commented out testEinsteinCrystal(), since it failed much too often
Speed up a slow test case by using a smaller topology file
Merge pull request #498 from peastman/master

Speed up a slow test case by using a smaller topology file
Changed travis script to run Python tests in parallel
Define value included one extra leading character
Merge pull request #500 from leeping/master

GromacsTopFile parses define value with one extra leading character
Use a newer version of nose in travis script
Merge pull request #502 from peastman/travis

[WIP] experiments to figure out how to get nose running in parallel
Added a test case to make sure future changes to ForceField do not change forces
Merged upstream changes
Made test case more tolerant of numerical differences between platforms
Merge pull request #505 from peastman/forcefield

Added a test case to make sure future changes to ForceField do not change forces