Closing this ticket may also solve this ticket :)
#4861 Make Morpheus a standalone theme and the default parent for all themes

This is excellent solution!
Why theming ?

:-(

In b1cdf0d: refs #5222 removed some more zeitgeist related styles

Why Theming?

Piwik is an open platform for analytics. Having theming as a core feature is an important part of the platform vision. When you track so much data, and spend so much time using one tool, it comes a point where you need to have full control over how it looks and behaves. Plugins let you change behavior and do amazing things with Piwik. Themes let you create a new look and visual experience for Piwik.

In a few months it will be easier to create Themes as we focus on making Morpheus a great theme that will be rather easy to extend. Stay tuned, for artists to create interesting themes. maybe end of year / early 2015?

In a1ac03c: refs #5222 fixes some ui tests

In 9f50ff4: refs #5222 the defaults theme javascript files are not added by a plugin.json definition, we have to add them separately

In 7a645e6: refs #5222 we have to include general forms later to make sure we override siteselector

In 3d87848: refs #5222 fixed some icons

In fdd8f26: refs #5222 overwriting the forms in base.less does not work as it breaks too many components. Trying to get the morpheus button working during installation while not breaking other components

In 77307e5: refs #5222 fix some more icons

In 323a47a: refs #5222 move search icon one px up

In c094f71: Merge pull request #292 from piwik/morpheus_defaulttheme

refs #5222 Remove Zeitgeist theme from Piwik and support only Morpheus

Adding to ticket:

• Update task should also delete plugins/Zeitgeist folder if it exists

In 4c78ba8: refs #5222 completely delete the Zeitgeist plugin

Closing it for now...