Update HOOMDMath.h
Update HOOMDMath.h

Added functionality to existing 'hoomd/HOOMDMath.h' file and remove incidentally uploaded 'hoomd/md/HOOMDMath.h'.
joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue