Add <cmath> to monte_carlo.cu. fixes issue 383
Add <cmath> to monte_carlo.cu.
fixes issue 383

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