0.5.0.3

- Changed (_WD_ExecuteScript): Optionally return value node instead of raw JSON (mLipok)
- Changed (_WD_ElementActionEx): Added support for "check" and "uncheck" commands (TheDcoder)
- Changed (_WD_GetElementFromPoint): Added support for frames
- Fixed (_WD_ElementAction): Return raw response for 'shadow' command
- Fixed (_WD_GetShadowRoot): Use shadow root identifier