Fix bug where SVG output would sometimes have extra </g> tag
Add support for multiplySeriesWithWildcards
Fix multiplySeriesWithWildcards help message
remove release date, still in development
Merge pull request #914 from obfuscurity/remove_release_date

Remove release date for 0.9.13 release notes
Providing optional step parameter for time(), sin() and randomWalk() functions.
Possible fix for issue #855
Merge pull request #916 from deniszh/master_step_parameter

Providing optional step parameter for time(), sin() and randomWalk() functions
remove graphlot and vendored libs
remove graphlot links
remove graphlot from setup
Merge pull request #918 from obfuscurity/retire_graphlot

Remove graphlot
use cairocffi instead of pycairo

As suggested by @brutasse and for #825
Merge pull request #919 from esc/use_cairocffi

use cairocffi instead of pycairo
remove unused icons and replace toolbar icons with a unified style
new icons converted from Font Awesome project
use alternate calendar icon
Merge pull request #922 from obfuscurity/new_toolbar_icons

Replace old composer toolbar icons
updating the copyright notice on the RTD site
updating the dates and attribution of the Copyright in the LICENSE file
Merge pull request #926 from gwaldo/copyindifferent

Updating Copyright in LICENSE and RTD site