Update to latest version of pytest
Set bigger screen size for headless browser
Remove source maps from JS dist files
Fix Django migrations after minor changes in release
Update dev requirements to latest versions
Fix deprecation warning in FP managers
Replace wysihtml5 editor with trumbowyg/froala

* Remove the old rich text editor 'wysihtml5'.
* Generalize the markup to hook up rich text editor into block edit
  forms.
* Provide customizable backbone views for rich text editor for
  initializing the editor and enabling live updates.
* Provide default implementation for Trumbowyg editor.
* Add implementation for Froala editor (not including requirements due
  to licensing terms).
* Convert related browser tests to function-based tests and make them
  run with the new setup.
Fix passing editor options for RTE in template
Fix generation of docs on RTFD
better page management
fixed conflict
fixing some sortable stuff
styling the page managment