Revert "Travis: fix conda create"
Revert "Travis: fix conda create"

This reverts commit dc37ea57f098a80877e5a7a4b37a24ee0a3b6b74.

svenpeter42/fastfilters,svenpeter42/fastfilters,svenpeter42/fastfilters,svenpeter42/fastfilters,svenpeter42/fastfilters