Fixed error with double/float in quatToR function.
Fixed error with double/float in quatToR function.

libhoomd/utils/QuaternionMath.h - changed instances of 2.0 to Scalar(2.0)


git-svn-id: 5cda8128732f5b679951344c24659131be7d2dfc@3977 fa922fa7-2fde-0310-acd8-f43f465a7996

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue