Default bin size on GPU is now much smaller 
Default bin size on GPU is now much smaller 

-> improves performance, especially in dilute systems

git-svn-id: 5fa832e94e4c40b9b44b314b3e8ab1cf80e064bf@2848 fa922fa7-2fde-0310-acd8-f43f465a7996

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