Changed from pygdf to cudf
Changed from pygdf to cudf

Fixes #1693

Author: Ivan Ogasawara <ivan.ogasawara@gmail.com>

Closes #1694 from xmnlab/pygdf2cudf and squashes the following commits:

cf7d79b [Ivan Ogasawara] Changed from pygdf to cudf

cpcloud/ibis,ibis-project/ibis,cloudera/ibis,cloudera/ibis,ibis-project/ibis,cpcloud/ibis,cloudera/ibis,cpcloud/ibis,ibis-project/ibis,ibis-project/ibis,cpcloud/ibis