Doesn't register/save trailing whitespace in IE

[Gankra]

• type in some junk
• refresh; changed content should still be there
• add some extra newlines to the end of the content
• refresh; newlines should still be there

This occurs correctly in chrome/FF, but the last step does not work in IE10 on the current master (epiceditor.com). Haven't tested IE9, but I suspect it's the same.

This also causes the editor to not emit "update" when new lines are added to the end of the document, which is breaking my current autogrow implementation.