[#64400282] added dismissable error / success messages on submitting shipments
moved flash container to a partial to make the placement more flexible across pages
changed the way parameters are passed to flash methods
added some magic code that is supposed to prevent the flash message from displaying before loading finished
Merge branch 'develop' into flash_messages_in_sandbox

Conflicts:
	app/assets/javascripts/trade/router.js.coffee
Merge pull request #189 from unepwcmc/flash_messages_in_sandbox

Flash messages in sandbox