Changed gb settings to use strings rather than named constants.
Merge branch 'upstream' into fork
Revert "Changed gb settings to use strings rather than named constants."

This reverts commit 4572d2e320208bbbf8a6573daa1f977135df3fde.
Platform specific header files get installed.  This allows plugins to be built with just an OpenMM installation, not a full source tree.
Merge branch 'headers' of https://github.com/peastman/openmm into headers
AmoebaMultipoleForce did not report particle groups, which could potentially lead to incorrect reordering
Created optimized version of AmoebaMultipoleForce kernels when all quadrupoles are 0
Merge pull request #47 from peastman/headers

Install platform specific header files, so plugins can be built without needing a full source tree
Merge pull request #48 from peastman/master

Fixed an atom ordering bug in AmoebaMultipoleForce
Implemented Einstein crystal unit tests, deleted ice unit test
Reverted testInstallation.py
Fixed ACE and NME groups for modeller.
Merge pull request #51 from leeping/hydxmlfix

Fixed ACE and NME groups for modeller.
Merge https://github.com/SimTk/openmm
Merge branch 'upstream' into fork
Removed trailing whitespace
Merge pull request #53 from jlmaccal/fix-whitespace

Fix whitespace issues
Cleanup and bugfixes to MonteCarloAnisotropicBarostat
Merge branch 'master' of https://github.com/leeping/openmm
Changed some includes in test cases