Merge remote-tracking branch 'hugh/tensorflow-dev'

remove spam a bit

fixes for building eigen on ubuntu 16.04

add COCL_DUMP_BUILD_LOGS=1, to show build logs

fix rpath in python package

remove spam

remove split and unpack for now (need float ** kernel parmaeters first)

no longer creashes on mac/rdaeon when running linear_regression.py

remove some spam

softmax, argmax/argmin, no longer xfail now