Implement Rdc translation and rotation tests.
Merge pull request #2 from maccallumlab/build

Modifications to use libc++
Merge branch 'master' of https://github.com/maccallumlab/meld-openmm-plugin
Merge branch 'master' of https://github.com/grollins/meld-openmm-plugin

it.
Merge pull request #1 from grollins/master

Rdc translation and rotation tests