Add a progress event while unzipping.
The progress is determined by the compressed file size and zip entries.
Add a unit test for zipArchiveProgressEvent.
Fix warnings on 64-bit
Fixed warnings from Xcode Analyzer
Merge pull request #99 from mr-fahrenheit/master

Fixed warnings from Xcode Analyzer
Merge branch 'master' of https://github.com/soffes/ssziparchive

# By Andreas Dangel (2) and others
# Via Erickson Pacioles (1) and Sam Soffes (1)
* 'master' of https://github.com/soffes/ssziparchive:
  Fixed warnings from Xcode Analyzer
  Fix warnings on 64-bit
  Add a unit test for zipArchiveProgressEvent.
  Add a progress event while unzipping. The progress is determined by the compressed file size and zip entries.