Foxit Reader 5.4.2.0901

# New Features:
- Supports opening PDF files on Microsoft SharePoint Server and allowing users to seamlessly check out and check in PDF files within Foxit Reader.
- Allows users to easily send, sign and save PDF documents and forms using DocuSign, the industry's most widely used eSignature solution.
# Bug Fixes:
- Fixed an issue where Foxit Reader may call and run malicious code in the Dynamic Link Library (DLL) file.
- Fixed an issue where the application cannot remember the last print paper size setting.
- Fixed an issue where certain digital signatures cannot be verified by Foxit Reader.