it would be good to fix all jshint errors in a single patch to avoid merge conflicts. - and do it as soon as possible. :mcav already started doing it for Clock app (Bug 972463)
Currently, there are 164 files to fix. https://github.com/mozilla-b2g/gaia/blob/master/build/jshint/xfail.list#L21-L184
closing this in favor of the meta bug.