openblas: Added TARGET=SANDYBRIDGE. According to their change log ( http://www.openblas.net/Changelog.txt ). This should support Haswell and thus Crystalwell as well. Note the list of supported targets ( https://github.com/xianyi/OpenBLAS/blob/develop/TargetList.txt ) does not explicitly include Haswell or Crystalwell.
openblas: Replaced head by working commit. Removed TARGET specification (seems to be working without it).
README_openblas: Added README to for openblas to explain TARGET specification and point to further information.
README_openblas: Added more details about default TARGET (NEHALEM) and a link to a list of architectures options for TARGET in the OpenBLAS repo. Broke up the contents a nicer more reader friendly way.