Oops, Heroku doesn't support npm@1.2.x yet

> Requested engine npm version 1.2.x does not match available versions:
1.1.65 1.1.49 1.1.41 1.1.40 1.1.39 1.1.36 1.1.35 1.1.32 1.1.9 1.1.4
1.1.1 1.0.106 1.0.94