Bump lodash dependency

Currently, this project [depends on lodash-node ^2.4.1](https://github.com/ef4/ember-browserify/blob/5cd89d202f277238b4c6ba9bab47a7ed528bee94/package.json#L40) which is deprecated and causes warnings at `npm install` time. Their recommendation is to upgrade to use the `lodash` package 4.x.
