Updates COPYING.rst
Updates the copyright boilerplate to include Enthought.

Everything is still BSD, so no worries.
Update Sphinx's conf.py with new copyright info.

Also, similarly update author info.
Make the Travis-CI build badge refer to master, not latest.
Merge pull request #166 from enthought/bugfix/travis-badge-master

Make the Travis-CI build badge refer to master, not latest.
Merge pull request #161 from enthought/feature/update-copyright

Updates the copyright date range and includes Enthought alongside IPython dev team