Added endpoints area to stage and tasks pages
Added endpoints dropdown as target field in query form, removed truncate
from grade_fascia, added new dropdown element.
Merge branch 'master' of
https://github.com/gradesystem/grade-console.git

Conflicts:
	lib/stage.dart
	lib/stage/stage_model.dart
	lib/stage/stage_page.html
	lib/stage/stage_service.dart
	lib/tasks.dart
	lib/tasks/tasks_model.dart
	lib/tasks/tasks_page.html
	web/service/catalogue/endpoints
fixed generics declaration
Added endpoint validation. Adde type to grade input