Add an optional device_id command line argument.
Add an optional device_id command line argument.

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40345

mohamed-ali/thrust,zhenglaizhang/thrust,jaredhoberock/thrust,zeryx/thrust,arnabgho/thrust,raygit/thrust,marksantos/thrust,sdalton1/thrust,sdalton1/thrust,mohamed-ali/thrust,zeryx/thrust,mohamed-ali/thrust,egaburov/thrust,dachziegel/thrust,GrimDerp/thrust,zhenglaizhang/thrust,arnabgho/thrust,thrust/thrust,sarvex/thrust,andrewcorrigan/thrust-multi-permutation-iterator,xiongzhanblake/thrust,egaburov/thrust,andrewcorrigan/thrust-multi-permutation-iterator,egaburov/thrust,GrimDerp/thrust,thrust/thrust,thvasilo/thrust,thvasilo/thrust,xiongzhanblake/thrust_src,sdalton1/thrust,arnabgho/thrust,Ricardo666666/thrust,xiongzhanblake/thrust,jaredhoberock/thrust,thrust/thrust,marksantos/thrust,marksantos/thrust,jaredhoberock/thrust,xiongzhanblake/thrust_src,Ricardo666666/thrust,zeryx/thrust,xiongzhanblake/thrust_src,sarvex/thrust,raygit/thrust,dachziegel/thrust,thrust/thrust,sarvex/thrust,zhenglaizhang/thrust,jaredhoberock/thrust,thrust/thrust,raygit/thrust,GrimDerp/thrust,jaredhoberock/thrust,thvasilo/thrust,Ricardo666666/thrust,dachziegel/thrust,xiongzhanblake/thrust,andrewcorrigan/thrust-multi-permutation-iterator