Document Ubuntu Orange change from #dd4814 to #e95420

At some point in early-2015 Ubuntu Orange RGB on the phone appears to have changed from #dd4814 to #e95420. Ideally this should be publicly documented to give the rationale, timeline, and backstory and how and where and the change originated.

This was originally picked up by Alan Bell in:

  https://lists.ubuntu.com/archives/ubuntu-community-team/2016-April/001202.html

Peter Mahnke stated that the Ubuntu Webteam had been asked to switch from #dd4814 to #e95420, but that this was not considered urgent. The change was accordingly rolled out with an update of the CSS framework:

  https://lists.ubuntu.com/archives/ubuntu-community-team/2016-April/001210.html

Ideally it would be possible to find out when/where/what/how/why and put a highly-visible update statement along the lines of the previous one at:

  http://design.canonical.com/2011/07/ubuntu-orange-is-dd4814/

See also:

  "Toolkit should use new orange #e95420"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-html5-theme/+bug/1572588