Working mail from notification. Still requires testing/cleaning
Add tests around checkout notification.
This also removes the ability to check out an asset to a location|asset
that requires acceptance/a Eula. For 4.1 we may think about how to
support such a thing, but at present it seems to make sense to only alow
such assets to be checked out to users, who can be responsible for the
items.
* Move slack integration to laravel5.3 style notifications, part 1.
* Fix consumable tab when active.
* Move the slack notifiable to the settings model. Move all slack notifications into logCheckout/logCheckin. Should think about refactoring this as an event at some point still. Move Asset checkin/checkout to use the general loggable trait rather than it's own solution.
* Fix a logic error where assets with a non deployable status would show checkin instead of no button at all.
* Fix an html formatting error that resulted in us not closing a form. This would cause the checkin page to try to submit a delete request (related to the modal form) rather than the desired checkin request. Also fix formatting in this file.
