Maxthon 3.3.9.600 Beta

# New Features:
* Supported HTML5 Microdata
* Added "Internet Options" to proxy menu
* Added message prompt when exited Maxthon Browser
# Fixes:
* Main Frame
- "Close with Maxthon" in External Tools did not work
- Could not remember SkyNote window size
- Improved Address Bar search logic
* Webkit Core
- Could not View Source of .svg images.
- Directory navigation bar of the file protocol displayed incorrectly
- Did not block some popup windows
- Magic Fill did not work for some sites
* Extension Platform
- Extensions still ran even after being disabled