Fixed konqueror browser support

KonquerorBrowserBuilder processes the following user agent string incorrect:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.34 (KHTML, like Gecko) konqueror/4.7.2 Safari/534.34

It tries to find only "Konqueror" string and ignores "konqueror" string. The issue has been fixed and a small test has been added.