Remove hardcoded osx sysroot
Merge pull request #27 from jlmaccal/fix-sysroot

Fix hardcode SYSROOT on mac.
Improved accuracy of SETTLE in mixed precision
Merge pull request #31 from peastman/master

Improved energy conservation in mixed precision mode
Merge branch 'master' of https://github.com/SimTk/openmm into vec3api
Merge branch 'vec3api' of github.com:leeping/openmm into vec3api