Add an alias "unit_tests" which simply builds the unit tester program (without having to specify the full path to the target).
Add an alias "unit_tests" which simply builds the unit tester program
(without having to specify the full path to the target).

Fixes #163

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