Share widget: Replaced role presentation with aria-setsize and aria-posinset to fix support for menu/menuitem ancestors/descendant relationships (#2680).
Merge pull request #2719 from pjackson28/sharewisgetariasetsizeposinset

Share widget: Replaced role presentation with aria-setsize and aria-posinset to fix support for menu/menuitem ancestors/descendant relationships (#2680)
Menu bar: Replaced role='presentation' with aria-setsize and aria-posinset to fix support for menu/menuitem ancestors/descendant relationships (#2680).
Merge pull request #2720 from pjackson28/menubarariasetsizeposinset

Menu bar: Replaced role='presentation' with aria-setsize and aria-posinset to fix support for menu/menuitem ancestors/descendant relationships (#2680)
Added functionality to send POST data to AJAXed lightbox content (#2686)