Add support for IE compatibility Trident tokens.

I had a few users that are apparently in IE 7 compatibility mode on IE 8 and IE 10. I had to look this up but apparently for IE 8, 9, and 10, the Trident token is a more reliable representation of browser version.

http://msdn.microsoft.com/en-us/library/ie/ms537503(v=vs.85).aspx#VerToken
http://msdn.microsoft.com/en-us/library/ie/ms537503(v=vs.85).aspx#TriToken

Warning: The `Tablet` test had `MSIE 7.0` and `Trident/6.0`. According to the document above, this should be IE 10 but it was being tested for IE 7. **I've made the change in this commit.**