ZIP distributions missing infinispan-core.jar and /lib when extracted with Windows Explorer

In the distribution archives infinispan-version-all.zip and infinispan-version-bin.zip, infinispan-core.jar should be in the directory "infinispan-version". Instead it's in "infinispan-version/.".

This causes a problem with some archivers, most notably Windows Explorer, which ignore the contents of the "." directory and only extract the rest of the archive.