Revert "add future auto detect npm version from deps/npm/package.json at github."

This reverts commit 58344e2e0fae8e97cd504f01612dddfea621d240.
support https protocol.
change source of npm version definition to https://raw.github.com/joyent/node/vX.X.X/deps/npm/package.json.
support not included npm, for old version node.js.
remove npm.json