Fixes #45: IndexOfOfBoundsException when calling Browser.IE11.getVersion
on valid IE11 user agent string

Identify IE11 version from rv:{major}.{minor} as decribed in

http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx
Fixes #45 The base MSIE regular expression should not parse the major and minor version based on Trident/{major}.{minor}

Fixes regression introduced in b50e3ead40a07d61a7e55da01e70d8c5ce94b825
Merge pull request #26 from parker/trunk

Fixes #45: IndexOfOfBoundsException when calling Browser.IE11.getVersion on valid IE11 user agent string