Merge pull request #70 from Bonbadil/develop

Avoid to rebuild tracks list unnecessarily.
Thank you !
(one think, I will put the hidden class to the spinner when is not shown, for accessibiity)
post merge correction: jshint, translation and behind
downgrading to 0.1.10 for quick version fix
reset distance between every import
going back to version 0.2.0 after big build bug