Add support for Opera Next (15+).
Made check for Opera Next more specific than checking for OPR.
Also make the check in the WebKit parser more specific than just checking for OPR for Opera Next.
Rename isOperaNext to isOpera and isOpera to isOldOpera.
Merge branch 'master' into bs-opera-next
Merge pull request #133 from typekit/bs-opera-next

Add support for Opera Next (15+).