Make tinyloglite insert printed text into body instead of HTML so clipboard operations are avail in IE

Test Plan:
- Pre fix, loaded in Win8 IE11 and could not copy text (context menu ops disabled), works after the fix.
- Installed Vista/IE9 and noticed it had the same issue, and that fix works the same as IE11.
- Verified DOM structure now puts the generated div into the body instead of document element.
- Loaded in Chrome, Firefox Nighlty, and Safari.  They work as expected.
- Fixes internal issue T2416.

Reviewers: john

Reviewed By: john

Maniphest Tasks: T2416

Differential Revision: http://phabricator.khanacademy.org/D8428