Implement auth by tokens in server.js
Delete passport and connect-mongo packages
Implement userService.forUserWithToken
Implement userService.destroyAuthToken
Delete serverTests.js
Refactore foodService
Refactore commentService
Generate authToken on signup or signin
Add user stub to mongooseMock util module
Fix some portion of userServiceTest unit tests
Fix userServiceTest unit tests
Refactore userService and server modules
Merge branch 'auth-tokens'