Maxthon 3.3.8.1000

# Improvements:
* Optimize Image Rendering
# Fixes:
* Webkit Core
- Reader Mode didn’t work when reading some txt files.
- Some links couldn’t be clicked in Ad Hunter rules in certain cases.
- Browser received incorrect Screen Attribute value.
- Message boxes failed to prompt in Skydrive page.
- Wrong displays in Maxthon Control Board.
- Youtube.com/html5 didn’t support H.264.
* IE Core
- Played Pop-up videos on top in Retro Mode.
* Maxthon Downloader
- Exited without clearing downloading history automatically
- Download task display problem in Download Dialogue.
* Extensions Platform
- Optimize System Service implementation