Update openmoltools meta.yaml for 0.6.7 release
Update openmoltools meta.yaml for 0.6.7 release

0.6.7 release adds some GROMACS support to openmoltools, as well as fixing some issues with error checking of AMBER tools and reorganization of AMBER-related functionality.

Former-commit-id: 9c4c662bd5c717737f753b46a0e32b267e2dfbec
rmcgibbo/conda-recipes,cwehmeyer/conda-recipes,peastman/conda-recipes,cwehmeyer/conda-recipes,omnia-md/conda-recipes,jchodera/conda-recipes,jchodera/conda-recipes,rmcgibbo/conda-recipes,peastman/conda-recipes,swails/conda-recipes,swails/conda-recipes,cwehmeyer/conda-recipes,rmcgibbo/conda-recipes,swails/conda-recipes,mpharrigan/conda-recipes,omnia-md/conda-recipes,omnia-md/conda-recipes,jchodera/conda-recipes,marscher/omnia-conda-recipes,marscher/omnia-conda-recipes,danielparton/omnia-md-conda-recipes,rmcgibbo/conda-recipes,peastman/conda-recipes,mpharrigan/conda-recipes,danielparton/omnia-md-conda-recipes,marscher/omnia-conda-recipes,swails/conda-recipes,cwehmeyer/conda-recipes,marscher/omnia-conda-recipes,mpharrigan/conda-recipes,jchodera/conda-recipes