Added friendly exception if ZipFS is used after the zip file is closed...
Added friendly exception if ZipFS is used after the zip file is closed...

git-svn-id: 74b2def6592cf29d88d1a5d33b5c4a2732d8507c@66 67cdc799-7952-0410-af00-57a81ceafa0f

atty303/pyfilesystem,lightkeeper/lspyfilesystem,lightkeeper/lspyfilesystem,anthonybishopric/pyboxfs,simonluijk/pyFilesystem,duedil-ltd/pyfilesystem,revolunet/pyfilesystem,anthonybishopric/pyboxfs,alekibango/pyfilesystem,alekibango/pyfilesystem,pscottdevos/pyfilesystem,pscottdevos/pyfilesystem