Work on pages that modify Array.prototype

for..in loop used in a client script breaks when page
under the test adds enumerable properties to Array.prototype.

Fixed by replacing for..in with .forEach

Fixes #105

lib/browser/client-scripts/gemini.js

@@ -131,8 +131,7 @@
             results = [],
             match;
 
-        for (value in values) {
-            value = values[value];
+        values.forEach(function(value) {
             if ((match = value.match(regex))) {
                 results.push({
                     offsetX: parseFloat(match[0]),
@@ -142,7 +141,8 @@
                     inset: value.indexOf('inset') !== -1
                 });
             }
-        }
+        });
+
         return results;
     }