Version 2.6.0

Version 2.5.0

Version 2.4.0

Version 2.3.0

Version 2.3.0-rc.1

Update version for v2.2.2 release

Prep for a v2.2.1 release

Version bump for v2.2.0

Merge pull request chartjs#2947 from chartjs/fix/524

Add polar area start angle setting

Fix missing Chart.js.zip file for Travis release