first working version with shuffle - but breaks lots of existing tests
nonbonded.cu will now use shuffles on sm_30 or higher
Merge branch 'master' of https://github.com/SimTk/openmm
bugfix to ifdef conditions in nonbonded.cu
minor bug fixes
Fixed debugging commits
Merge pull request #7 from proteneer/master

Nonbonded.cu now uses shuffle intrinsic