Add Python version trove classifiers
Build universal wheels
Merge branch 'master' into next

* master:
  Build universal wheels
  Add Python version trove classifiers
Fix #490: Item editor buttons for media files fixed for Django 1.6
flake8-clean the code a bit

We still have a few ignored error codes and excluded folders left.
Fix occurrences of E126
Merge branch 'master' into next

* master:
  Fix occurrences of E126
  flake8-clean the code a bit
  Fix #490: Item editor buttons for media files fixed for Django 1.6
FeinCMS v1.8.4
Try again
Merge branch 'master' into next

* master:
  Try again
  FeinCMS v1.8.4

Conflicts:
	feincms/__init__.py
Update jQuery and jQuery UI

Refs #489.
Add a note to the release notes concerning the update of jQuery (UI)
Merge commit 'b3b2eb96a20c0c332267cab8d43535f6be9171b4' into next
Merge branch 'next' of github.com:feincms/feincms into next
Extract tab construction to own function, so one can reuse it for other tabs.
Merge branch 'next' into tabbed_options2
Morph extensions options into a tab-bar.
Merge branch 'tabbed_options2' into next
Add a too-small-note to the release notes about the tabbed extension interface
Also allow directly passing subclasses of Extension to register_extensions