MySQL model

to launch db dump, go into **oauth-server/database** and type
**node create_db.js**
(first set db credentials on **config.js**).
to enable mysql model edit line 1 of **oauth-server/oauth-server.js**
`var TYPE = 'memory';`
to
`var TYPE = 'mysql';`

test users are (username/password):
test@todo.to.it / todo
test@arduino.cc / arduino