Backport workflow context and field support

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_states/widgets.py

@@ -1,17 +1,6 @@
 from __future__ import unicode_literals
 
 from django import forms
-from django.utils.html import format_html_join
-
-
-def widget_transition_events(transition):
-    return format_html_join(
-        sep='\n', format_string='<div class="">{}</div>', args_generator=(
-            (
-                transition_trigger.event_type.label,
-            ) for transition_trigger in transition.trigger_events.all()
-        )
-    )
 
 
 class WorkflowImageWidget(forms.widgets.Widget):