Changed IssuesController#destroy to DELETE only.
Removed obsolete project news route.
Moved bulk_edit/update routes into issues resources.
Custom fields display on bulk edit form.
REST urls for user memberships.
Resourcified roles.
Resourcified custom fields.
Renamed TabularFormBuilder to Redmine::Views::LabelledFormBuilder.
Removed TabularFormBuilder references in views.
Use #labelled_form_for instead of #labelled_tabular_form_for.
