Created API and reference implementation of restricting CustomNonbondedForce to selected interaction groups
Created CUDA implementation of restricting CustomNonbondedForce to selected interaction groups
Fixed Python API for CustomNonbondedForce.addInteractionGroup()
Bug fixes and an optimization to CustomNonbondedForce with interaction groups
Began creating OpenCL implementation of CustomNonbondedForce interaction groups
Finished OpenCL implementation of interaction groups
Bug fixes to interaction groups
Implemented long range correction for interaction groups
Merge pull request #98 from peastman/groups

CustomNonbondedForce can restrict the computation to particular groups of atoms
Fixed the C and Fortran wrappers, which were broken by the addition of interaction groups
Fixed compilation errors on Windows
Merge pull request #104 from peastman/master

Fixed some compilation errors
simtk.openmm.__version__ always matches the OpenMM version number
Simplified reference platform code for processing nonbonded exclusions
Merge pull request #105 from peastman/master

Assorted code cleanup
Improvements to Gromacs file processing
Merge pull request #106 from peastman/master

Improvements to Gromacs file processing
Fixed bug under certain compilers
Fixed crash due to a kernel's arguments having changed
Fixed an overly sensitive test case that tended to fail