Fix ctrl+click on links in IE (part 2)

An addendum to my previous commit (https://github.com/box/viewer.js/commit/00094befdd5621431459ccc004e0787db8459cb7),
where ctrl+click still triggered native event behavior in IE, because
of the way jQuery event delegation works. This solves the issue by
individually installing click handlers for each link.
Merge pull request #35 from box/fix-ctrl-click-ie

Fix ctrl+click on links in IE (part 2)