Anchor API Auth

[gregfrasco]

Add Authentication Checks into Pre Routes.

Should check authentication with basic and session if Model.routes[route].auth is equal to true

Pre Methods

• authEnabled - is auth enabled
• simple - simple auth test runs in parallel with other auth tests. Return creds or null - doesn't throw an error
• session - session auth test runs in parallel with other auth tests. Return creds or null - doesn't throw an error
• credentials - check if any auth pres is valid and returns a creds object (user and session) or throws error if all failed 401 unauthicated

[FrancisZamora]

Closing in #157