Created optimized version of AmoebaMultipoleForce kernels when all quadrupoles are 0
Merge pull request #54 from leeping/master

Small Modeller fix
Personal commit to make modeller easier to use
Merge github.com:leeping/openmm
Merge branch 'master' of github.com:SimTk/openmm
Merge branch 'quadrupoles' of github.com:peastman/openmm