Fixes the issue with VssDiff and VssHistory treating labels as case-sensitive. The SourceSafe labels are case-insensitive.
Added Zip64 task option that allows save in Zip64 format when needed. The original behavior would cause zip task to fail if archive size exceeds original Zip limit.
Merge remote-tracking branch 'upstream/master'
Merge pull request #88 from apkbox/master

Fix for Visual Source Safe task and Zip task improvement.