Revert "Confirmation message opens in modal dialog"

This reverts commit f5caf6164d33c844e31f3ed3a7fdb199a93141c2. We
decided modals are unnecessary, instead we will use more prominent
alerts.
Use `:error` and `:success` for flash messages instead of alert so they can be appropriately styled
Move flash messages under nav and style as success, error or warning
Merge branch 'master' of https://github.com/atlrug-rhok/medlink

Conflicts:
	app/views/layouts/application.html.haml
Merge branch 'master' of https://github.com/emilymerwin/medlink into emilymerwin-2-master