added sgemm- and dgemm-kernel for HASWELL processor
added zgemm_kernel_4x2_haswell.S and fixed a bug in sgemm_kernel_16x4_haswell.S
sgemm_kernel_16x4_haswell.S minor changes
added sgemm_kernel_16x4_haswell.S
added dgemm_kernel_16x2_haswell.S
added zgemm_kernel_4x2_haswell.S
added cgemm_kernel_8x2_haswell.S
Merge pull request #278 from wernsaar/haswell

 Merge wernsaar's Haswell gemm kernels.