replace float2 with tuple<float,float> in bucket_sort2d example resolves issue #420
replace float2 with tuple<float,float> in bucket_sort2d example
resolves issue #420

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