ENH: BLAS level 3: xSYMM
ENH: BLAS level 3: xSYRK
BLAS level3 : syrk, syr2k
BLAS level 3: hemm, herk, her2k
added missing depend attributes (travis build fails on py3.3?)
clean up tests
Merge pull request #2504 from bburlo/blas3

ENH: linalg: expose a part of blas3 functionality