Messes with selection & focus on load

[adam-lynch]

WrappedSelection and TextRange interfere with the page's selection on load. For example, if Rangy is used in an extension, google.com's search field isn't focused (on load).

As the comment mentions, these tests were done in an iframe (which avoids these issues) but it caused problems in IE (#109). I think this can now effectively be reverted; IE support isn't required any more. I've tested it.

I would submit a pull-request but the library is unmaintained; happy to help if that changes.