Version number bump in preparation of the release.
Filled up the changes to the CHANGES.txt changelog file.
Merge branch 'master' into release/440
Update the copyright notice in docs/source/conf.py .
Minor tweaks to the wording of CHANGES.txt.
Merge pull request #151 from enthought/release/440

Version number bump in preparation of the release.
BUG: include _isnan.h to fix cython speedup compilation.
Merge pull request #156 from cournape/fix_sdist_tarball

BUG: include _isnan.h to fix cython speedup compilation.
Version number bump for release of 4.4.1.
Merge pull request #157 from enthought/release/4.4.1

Version number bump for release of 4.4.1.
Post release version bump.
Tweak the version number to match other ETS projects.
Merge pull request #159 from enthought/post_release_version_number_bump

Post release version number bump
Merge branch 'master' into python3