Scaffolding for import progress reporting
Route ajax request to appropriate view, and show feedback only then
Hook up view
Fix getStatus function
Studio: revises general layout/styling of import view and adds in detail progress feedback after import (WIP)
Studio: removes import progress bar HTML and Sass; hides import status by default
Studio: revises import file upload success copy; sets up showing/hiding states for import status and additional messages
Studio: revises iconography and adds in success step in import status feedback
Studio: adds hidden styling back into import status UI