Pdf Unstamper Versions Save

New version based on 0.1.0 with changes:

• Optimize performance with thread-safe improvement
• Disable commons-logging in Apache PDF-Box

A brand new version, including changes:

• new algorithm to provide support for the removal of text stamp of any font, any encoding and any language
• remove -t/--cut-tail option, so you must provide at least one keyword to the -k option
• better logging

A new version with support of ituring.com.cn:

• provides -t(--cut-tail) option for stamp removal of ituring.com.cn's PDFs
• -w option is optional now due to the birth of -t

This is a initial version with very basic functionalities:

• single/massive file(s) processing
• directory recursively(optional) processing
• multiple stamp key words