Added ability for unzip visitor function to return false which would cause the file to be skipped from being unzipped.
Added ability for unzip visitor function to return false which would cause the file to be skipped from being unzipped.

titanium-forks/appcelerator.node-appc,Akylas/node-appc,titanium-forks/appcelerator.node-appc,FokkeZB/node-appc,titanium-forks/appcelerator.node-appc,Akylas/node-appc,FokkeZB/node-appc,Akylas/node-appc,FokkeZB/node-appc