Init AMD Bulldozer codebase.
Added BULLDOZER target. So far it uses barcelona kernels.
Refs #54. Added AMD Bulldozer x86_64 dgemm kernel developed by Werner Saar <wernsaar at googlemail.com>

Based on the dgemm kernel for AMD Barcelona, he used AVX and FMA4 instructions.
Thank Werner Saar!
Write FMA4 flag to the configure file.
Merge branch 'bulldozer' into develop