Remove blas.Order from blas package.

It was decided, after discussion on the gonum-dev list, to remove
support for column-major matrices in the blas package. This commit
completely removes all public support for the blas interface. Some
necessary residuals remain in the cblas package because the c functions
require specifying an order. However, these residuals are private and
are thus invisible to package users
Merge branch 'master' of https://github.com/btracey/blas