Issue with depend on keygrip for Node 0.8.x

[okuryu]

Need to install [email protected] for use ntwitter on Node 0.8.x, but [email protected] actually depend on [email protected].

$ npm ls                 
/Users/okuryu/work/ura
└─┬ [email protected] 
  ├── [email protected] 
  ├── [email protected] 
  └── [email protected] 

$ grep keygrip node_modules/ntwitter/package.json
    "keygrip": "0.1.x"