Create the top-level namespace for Bulk in the same manner as CUB.
Create the top-level namespace for Bulk in the same manner as CUB.

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