Bug 970147 - fixes collapse in IE (Bootstrap bug)

@smarterclayton, @liggitt: this is the bug 970147 related to collapsible menus only toggling once and then breaking on IE.

It's a Bootstrap issue fixed in 2.1.1 so it requires patching bootstrap in origin-server/console/vendor. The patch is decently isolated in collapse-related files (which are only used in the collapsible menus afaik), but we might want to consider if this fix is worth changing vendor stuff like I did in this pull request, and/or upgrading the whole Bootstrap.