fix repak.js on newer versions of node

There were 2 separate issues:
* the specified version of  uses os.tmpDir() instead of os.tmpdir()
* the  package doesn't work anymore, and should be replaced by the built-in

This fixes inolen#69.

bin/repak.js

@@ -4,7 +4,7 @@ var fs = require('fs');
 var logger = require('winston');
 var path = require('path');
 var exec = require('child_process').exec;
-var execSync = require('execSync').exec;
+var execSync = require('child_process').execSync;
 var os = require('os');
 var temp = require('temp');
 var wrench = require('wrench');

package.json

@@ -17,12 +17,11 @@
     "async": "~0.2.9",
     "buffer-crc32": "~0.2.1",
     "ejs": "~0.8.4",
-    "execSync": "~1.0.1-pre",
     "express": "~3.3.5",
     "optimist": "~0.6.0",
     "quakejs-files": "0.0.3",
     "send": "^0.16.2",
-    "temp": "~0.5.1",
+    "temp": "^0.9.1",
     "underscore": "~1.5.1",
     "winston": "2.4.0",
     "wrench": "~1.5.4",