Checking if an email address is being used by another user in validation.
Loding local configs in config.js
Updating the readme.
Fixing user.authenticate
Fixing user.email
Fixing user.create.
Adding 'couchdb' to local settings example.
Replacing 'lodash' with 'underscore'
Fixing local example and adding testing settings
Adding installation file.

This should have been included back when I added auth.install, but I'm stupid
and lazy.
Fixing utils.createPassword
Adding tests.

Run them with `npm test`.
Updating package.json