The patch removes the "files" section from package.json to avoid future issues
with missing files. For package testing purposes, 'npm pack' is used instead
of plain 'tar' to simulate packaging more accurately.
This makes the "sed" instruction simpler and more portable, as the previous
variant didn't work well on BSD systems due to the "\s" metacharacter.
Thanks to Sergey A. Osokin <osa@FreeBSD.org.ru> for spotting this issue.
Also, this should prevent accidentally creating a version 1.0.0 package.
