updated shouldOverrideUrlLoading event for #146, added print method and event...

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true