app: add select by state on waybills page by slider with checkboxes bug(284)

Conflicts:
	app/assets/javascripts/application.js.coffee
	app/assets/javascripts/knockout.slidearea.js.coffee
	app/models/waybill.rb
	spec/requests/waybills_spec.rb
app: add column 'state' to deal_states

Conflicts:
	app/models/helpers/statable.rb
	spec/models/waybill_spec.rb