tagging version 1.3.0

Merge pull request spacetelescope#53 from spacetelescope/testing_setup

This PR adds several updates to stistools.  Removes distutils dependency, removes Python 2 support, pep 8 fixes, and adds artifactory unit tests.

hstdp-2015.3

update version string for stistools docs

git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stistools/tags/release_1.0.2@30805 fe389314-cf27-0410-b35b-8c050e845b92

remove download url

git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stistools/tags/release_1.0.1@24567 fe389314-cf27-0410-b35b-8c050e845b92