rewrite ibox plugin and update ibox references
fix small jump in fade in/out animation as page margin is added/removed
delete old ibox files, add minified version of new modal plugin, update plugin refs
clarify comment in plugin script; include file deletes properly this time
add correct class and aria attribute to client-created modal links
fix logic error in enter/esc key handler
update jquery event binding in modal popup code
manual rebase to include jquery update
modal window styling tweaks: increase content padding, decrease title top margin
Merge pull request #988 from tuff-ghost/issue_3380

3380 & 2928: rewrite ibox (modal dialogs) plugin