use pty.js that merges in niallo:waitpid fixes as in terryschen:wetty

Author: lucamilanesio

package.json

@@ -4,7 +4,7 @@
   "dependencies": {
     "express": "3.5.1",
     "websocket": "",
-    "pty.js": "",
+    "pty.js": "git+https://github.com/terryschen/pty.js",
     "optimist": "",
     "waitpid": ""
   },