Fix the keydown event unit tests
Fix the wait_for_selector_all unit test
The method JS.reset_previous_keycode is now tested
Now hide the hero helps
JS.regex_test is now properly tested
JS.each has been tested
Add JS.dispatch_event test
Simplify a unit test
Fix a bug occuring in Firefox because the event.timeStamp is in microsecond
JS.assign_attribute is now tested
JS.insert_after is now tested
JS.parse_xml is now tested
JS.nodelist_to_array is now tested
JS.jsonToDOM is now tested