Colour spectrum prototype.
* Can apply and remove colours to and from tags.
* Bugfixes:
  - Fixed "or=" mistakes.
  - Fixed the tag comparator, so sorting should work again.
  - Logo is clickable again.
  - The cancel button turns back into an add button after adding an item again.
Merge branch 'master' of git@github.com:webistor/webistor-app.git