Maxthon 3.1.7.1000

# New Features:
* Supported HTML 5 feature: drag & drop to upload files in Skydrive and add attachments in Gmail.
# Improvements:
* Enhanced the logic of data syncing.
* Increased Webkit startup speed.
# Fixes:
* Main Frame
- Invalidation of clicking tray icons in Task Bar.
- Redundant links appeared in Navigation History.
- Failed to save the setting of "Customiza UI" without auto login.
* Webkit
- Maxthon browser might lose response when runned some programs.
- Some Webkit crash problems.
- Improved the compatibility.
- Disappearance of "Copy" when right clicked some pictures.
* Trident
- window.open did not use blank page in Retro Mode.
* User Interface
- Display error in Side Bar.
- Failed to cancel the check in select box of Source Sniffer if checked it with no content.
- Thunder Downloader UI & language problem.
* Maxthon Thunder Downloader
- Solved the problem of high source occupation.
- Improved the compatibility.
* Source Sniffer
- Display problem of downloading in bulk in Source Sniffer.
* Inspect Element
- It would be saved as HTML file if right-clicked to save image when opened Inspect Element.