ZF-5302: add ability to use conditions in HeadScript, append/prepend methods


I have a condition where I would like to conditionally add a


Similar functionality is already present in ZF for Stylesheets using the $conditionalStylesheet method in the HeadLink helper like:

appendStylesheet($href, $media, $conditionalStylesheet)

It would be nice to have the same conditional setup for


This was fixed in the 1.7.2 release.