add package openblas

based on: http://hg.octave.org/mxe-octave/file/default/src/openblas.mk
doc update: add GNU Licenses FAQ
doc update: add legal notes

from a long time ago:
http://lists.nongnu.org/archive/html/mingw-cross-env-list/2011-03/msg00107.html
doc update: add GNU Licenses FAQ
Merge branch 'stable'
package blas: tidy up build rule
doc update: add gpatch to OSX requirements

closes #335
package hdf5: enable shared builds and detection of pthreads and zlib
Merge commit '6cdb1fce4ce06572f875d65083729110918045de' into my

* commit '6cdb1fce4ce06572f875d65083729110918045de':
  package hdf5: enable shared builds and detection of pthreads and zlib
  doc update: add gpatch to OSX requirements
  package blas: tidy up build rule
  doc update: add GNU Licenses FAQ
  doc update: add legal notes
  doc update: add GNU Licenses FAQ
  add package openblas

Conflicts:
	index.html
	src/openblas.mk