[DRAFT] Version 1.0 Update Notification

First draft of update notification for 1.0.

Since we can't control the update notification dialog like we wanted to -- The first item in the new features list is a note that this is our 1.0

Let me know what you want changed.
Note it works for JS as well (and LESS + SCSS) - I'm not sure though whether we should include it, as the main use case is definitely CSS files.