I asked in #travis - I also do not know

I printed the config of travis with `npm conf list` in a testrun to find that out:

```
          ; cli configs
          registry = "https://registry.npmjs.org/"
          
          ; environment configs
          bin-links = true
          cache = "/home/travis/.npm"
          cache-lock-retries = 10
          cache-lock-stale = 60000
          cache-lock-wait = 10000
          cache-max = 0
          cache-min = 10
          color = true
          depth = 0
          description = true
          editor = "vi"
          fetch-retries = 2
          fetch-retry-factor = 10
          fetch-retry-maxtimeout = 60000
          fetch-retry-mintimeout = 10000
          git = "git"
          git-tag-version = true
          globalconfig = "/home/travis/.nvm/v0.11.11/etc/npmrc"
          globalignorefile = "/home/travis/.nvm/v0.11.11/etc/npmignore"
          group = 1000
          heading = "npm"
          init-license = "ISC"
          init-module = "/home/travis/.npm-init.js"
          loglevel = "http"
          message = "%s"
          node-version = "0.11.11"
          optional = true
          prefix = "/home/travis/.nvm/v0.11.11"
          proprietary-attribs = true
          rebuild-bundle = true
          registry = "https://registry.npmjs.org/"
          rollback = true
          searchsort = "name"
          shell = "/bin/bash"
          shrinkwrap = true
          strict-ssl = true
          tag = "latest"
          tmp = "/home/travis/tmp"
          umask = 1
          unicode = true
          unsafe-perm = true
          user = 1000
          user-agent = "node/v0.11.11 linux x64"
          userconfig = "/home/travis/.npmrc"
          viewer = "man"
          
          ; node bin location = /home/travis/.nvm/v0.11.11/bin/node
          ; cwd = /home/travis/build/robertkowalski/npm/test/tap/ls-depth
          ; HOME = /home/travis
          ; 'npm config ls -l' to show all defaults.
```