Created a model anisotropic pair potential evaluator class, acutally added it this time...r
Created a model anisotropic pair potential evaluator class, acutally added it this time...r

git-svn-id: b0ce8a66c7afc16299a22e7bdfdcc4c374c2bce9@3813 fa922fa7-2fde-0310-acd8-f43f465a7996

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