added TestZipIteratorScan unit test
added TestZipIteratorScan unit test

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40395

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