Handle errors when extracting ZIP archive

[thisandagain]

[mewtaylor]

This came up in search:

/var/app/current/node_modules/scratch-parser/node_modules/adm-zip/headers/entryHeader.js:140
                throw Utils.Errors.INVALID_CEN;
                ^
Invalid CEN header (bad signature)

[mewtaylor]

Didn't mean to close this, sorry!

[mewtaylor]

Seems relevant: http://stackoverflow.com/questions/17570548/node-js-unzip-file-with-non-ascii-file-names