IE8 Fixes

Resolves: 

* https://github.com/openannotation/annotator/issues/426
* https://github.com/openannotation/annotator/issues/425
* https://github.com/openannotation/annotator/issues/422
* https://github.com/openannotation/annotator/issues/421
* https://github.com/openannotation/annotator/issues/420
* https://github.com/openannotation/annotator/pull/412
* https://github.com/openannotation/annotator/issues/419
* https://github.com/openannotation/annotator/issues/418
* https://github.com/openannotation/annotator/issues/417
* https://github.com/openannotation/annotator/issues/416
Could you drop a comment about this or change the test so that it's additionally asserting that the text content is what we expect? As is it looks like the case of the content is being changed for some reason, and not obvious to me that the problem is the case of the tags.