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Optimization to nonbonded forces: replaced divides by multiplies when applying periodic boundary conditions

All platforms now handle nonbonded exceptions in a consistent way (they ignore cutoffs and periodic boundary conditions).  Also started OpenCL implementation of CustomHbondForce.

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Redesigned CustomNonbondedForce to eliminate combining rules and allow the expression to directly use parameters for individual particles.

Created #define for LOCAL_HACK_PI to sidestep bug on Windows cuda compiler which ignores "static const float ..." variables.
In files kCalculateCDLJEwaldFastReciprocal.h, kCalculateCDLJForces.h and kCalculateLocalForces.cu.

All energies existing in Preview Release 3 now run on the GPU, new Ewald energy terms still use Reference implementation

Real space Ewald (direct summation) is now in kCalculateCDLJForces.h, reciprocal summation is done in a separate kernel