fix #417 Drag utility fails after fix #397

The workaround introduced in #397 about the mouse move is now effective
only for webkit

Close #418
fix #419 Issue in DialogOnResizeTestCase

resolves an issue for DialogOnResizeTestCase (and possibly others) where there is an assumption that the HTML element will contain a style attribute.
fix #420 CssLoader test case for slow networks

Fix a test case that fails when the browser is too slow to apply the css
rules of a newly loaded css file
fix #422 tests failing in old browsers

Fix two tests failing in IE7 and FF3.6
fix #385 Gestures test cases

Fix an error in the test cases of gesture events