sprockets_better_error still reports: Asset depends on 'select2.png'

[gfauredumont]

Issue #70 was already about this but even after my 2 posts, there is no change:
https://github.com/argerim/select2-rails/blob/master/vendor/assets/stylesheets/select2.scss
is still missing the depend_on_asset lines at the beggining of the file.

//= depend_on_asset "select2.png"
//= depend_on_asset "select2-spinner.gif"
//= depend_on_asset "select2x2.png"

I'm probably switching to Bower but will try to do a PR anyway...