Add shebangs for bin/ scripts, chmod 755 for completion.sh

bin/npm-get-uid-gid.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 var argv = process.argv.slice(2)
   , user = argv[0] || process.getuid()
   , group = argv[1] || process.getgid()

bin/read-package-json.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 var argv = process.argv
 if (argv.length < 3) {
   console.error("Usage: read-package.json <file> [<fields> ...]")