ied i -g flint

We have a pretty massive CLI that installs tons of stuff. It takes a ton of time with npm, but installing it into a local directory with ied is super fast.

When I try `ied i -g flint` it gives me this:

```
zsh: correct ied to id [nyae]? n
/Users/nw/.nvm/versions/node/v5.2.0/lib/node_modules/ied/lib/install_cmd.js:65
if (err) throw err
^

Error: EINVAL: invalid argument, readlink '/Users/nw/flint/node_modules/lodash'
at Error (native)
```

Perhaps a good test case for ied, would love to use it in general.

Node: 5.2.0