Add benchmark argument

Add benchmark argument
Merge branch 'master' of https://github.com/samminweng/SieveofEratosthenes

Conflicts:
	OpenCLSieveofEratosthenes/Main.c

	OpenCLSieveofEratosthenes/benchmark/openclSieve.Kernel_ulong.cl.Limit10.WorkGroupSize64.Block64.Global64.csv