Add date parameter to 'zipDirectory'
Add date parameter to 'zipDirectory'

I was having issues when comparing two zipped folders` hashes.
After checking the source code, I found out that the culprit is the `modified` parameter that can be passed to the `ZipEncoder` class, which is used by the `ZipFileEncoder` class.
Adding a `modified` optional parameter to the `zipDirectory()` and passing it down until the `startEncode()` method allowed me to set a specific date for the hash generation, which fixed the problem.
brendan-duncan/archive,brendan-duncan/archive