Added hasOwnProperty check

This ensures that the result output is clean of extended type methods

src/ua-parser.js

@@ -89,6 +89,7 @@
                 if (typeof result === UNDEF_TYPE) {
                     result = {};
                     for (p in props) {
+                        if (props.hasOwnProperty(p)){
                             q = props[p];
                             if (typeof q === OBJ_TYPE) {
                                 result[q[0]] = undefined;
@@ -97,6 +98,7 @@
                             }
                         }
                     }
+                }
 
                 // try matching uastring with regexes
                 j = k = 0;