Revert "updated travis config. removed cython"

This reverts commit c023eb22368c3db42823c2a1dc0dc12f9c4e99ca.
Revert "Fixed failed locating of config.cfg while rerun"

This reverts commit c8affef45a86af02551552be96403f2da85766df.
Revert "Revert "updated travis config. removed cython""

This reverts commit 21f83fa5e851cb243fc11eb9398e73ef16fa27f0.
Revert "Revert "Fixed failed locating of config.cfg while rerun""

This reverts commit 4c92ac07ec4d37d0ebbb42fc460e170b88940cc5.