Moving new carousel / slideshow feature in upload element into adaptor
models.
Jaanus 'repeat element in repeat group' fixes, first cut.
Fixing some int vs string === issues in form JS.
Added FArrayHelper::emptyIsh(), which is like empty(), except return
true if the array on has one item, which is either an empty string, or
null.
More work on 'slideshow' mode in fileupload, moved in to adapter models,
added JW player, etc.
Adding jwplayer to upload element libs.  Should probably move this to
main libs, for when we improve the media/slideshow viz, etc.
Merge branch 'joomla3' of github.com:Fabrik/fabrik into joomla3
Fix for AJAX upload, was breaking if a non-AJAX upload element came
after an AJAX one, which was overwriting the requirejs shim and removing
the plupload deps.
Merge branch 'joomla3' of github.com:Fabrik/fabrik into joomla3