Changed algorithm for supported versions
Available Versions: Update algorithm for which LO versions we display

See more information in the meeting agendum from Dec 2nd:
https://wiki.documentfoundation.org/QA/Meetings/2013/December_02#BSA_Available_Versions
Merge branch 'version-cleanup'
fdo#7249 - Fix syntax for optional function params

Only FireFox currently supports the PHP/Python/etc... syntax for
referencing optional javascript function arguments:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/default_parameters

https://bugs.freedesktop.org/show_bug.cgi?id=72497