This release adds fixes and tests for a number of issues parsing the new Windows Phone 8.1 monstrosity of a user agent string.
See:
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11; IEMobile/11.0) like Android 4.1.2; compatible) like iPhone OS 7_0_3 MacWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.99 Mobile Safari /537.36
Note the mismatched parenthesis, and claims of being nearly every browser. Thanks, Microsoft!