Remove hardcoded osx sysroot
Began implementing CPU based PME
Merge pull request #24 from peastman/master

Various bug fixes and code cleanup
Continuing to implement CPU based PME
Optimizations and bug fixes to CPU based PME
Parallelized the reciprocal convolution and force interpolation.
Parallelized charge spreading for CPU based PME.
Continuing to implement CPU based PME
Merge pull request #27 from jlmaccal/fix-sysroot

Fix hardcode SYSROOT on mac.
Fixed threading problems in CPU based PME
Connected CPU based PME to CUDA platform
Moved CPU based PME to a separate plugin
Merge branch 'pme' of https://github.com/peastman/openmm into pme
File missed in last checkin
Merge branch 'pme' of https://github.com/peastman/openmm into pme
Fixed compilation errors on Linux
Optimized reciprocal space convolution by caching scale factors
Created AVX version of charge spreading.  Also fixed incorrect energy computation.
Merge pull request #31 from peastman/master

Improved energy conservation in mixed precision mode
Bug fixes and minor optimizations