Merge pull request #121 from peastman/master

Fixed bug in Fortran header
Merge pull request #122 from peastman/master

Fixed bug in RPMD when using contractions
GBSAOBCForce adds an offset to the energy to reduce the discontinuity at the cutoff
CustomGBForces apply the same energy offset as GBSAOBCForce
Fixed an incorrect sign
Merge pull request #123 from peastman/gb2

Apply an offset to GB energy when using a cutoff to reduce the discontinuity
Merge pull request #125 from peastman/master

Improved error checking in ForceField
Merge pull request #126 from peastman/master

Minor enhancements and bug fixes
Merge pull request #128 from peastman/master

Changes needed by PDBFixer
Merge pull request #130 from peastman/master

Fixed bug in RPMD contractions
Merge pull request #133 from peastman/master

Handle exceptions correctly inside getState()
Merge pull request #134 from peastman/master

Fixed compilation errors on some platforms