Add spinner when adding a backend
Merge branch 'master' into backends
Account for errors in deploy_script.

do not rerun if we hit an error -- we need to revisit this once
we are ready to support more images.
Automated build of mist.js
Merge branch 'keys_refactoring'
Merge branch 'backends'
Automated build of mist.js
Merge branch 'master' into keys_refactoring