Enable access control.

Add "Customer hasMany AccessToken" relations and other models
required by ACLs.

Add unit-tests for /api/customers.
Add the utility to recreate tables
Allow tests to run against demo oracle/mongodb

Modify config.js to use "demo" when NODE_ENV is "test" and custom
config is not provided.

Increase the timeout for data import.
Merge pull request #39 from strongloop/feature/enable-access-control

Enable access control