Fix fancybox 1.3.4 for latest jQuery

[phantom-d]

I recommend change fancybox to http://dimsemenov.com/plugins/magnific-popup/

[jenkinsadmin]

Thank you for a pull request! Please check this document for how the Jenkins project handles pull requests

[KostyaSha]

Please provide screenshots before and after, plus described why plugin should bundle additional js file (what license does it has?)

[mbidewell]

Something needs to be done about fancyBox, the fancyBox-jQuery compatibility issue not only impacts console output (which can be worked around), but also blocks the execution of pipelines with parameters (which cannot be worked around).

[mbidewell]

jquery migrate is provided by jQuery and is licensed MIT (http://blog.jquery.com/2013/05/08/jquery-migrate-1-2-1-released/). It is a compatibility shim which reenables removed functionality in jQuery which fancyBox relies on. There is no little to no visual difference. Long term, moving to a library like Magnific Popup that is maintanable would be good (assuming the fancyBox 2.0 licence change renders it unusable), but in the short term, pushing this fix will reenable some vital functionality