* refactors AbstractDeadlineViews (new, edit, remove) to inherit from BaseModalFormView * refactors KOM, OEK, EMA views for deadline views
* adds new login_required_modal decorator * can be used before regular login_required decorator to return a proper session-timed-out message
* replaces ema deadline views with class based
* splits ema/views.py (+700 lines) into separate files in new module * view files can now be found in /ema/views/...
