Add cors to routes

[raduorleanu]

• App.ts options add app.options("*", cors());

• Change routes everywhere to have [cors(), checkJwt]. cors() must be first, checkJwt must be second

• Send token as object instead of string in authController

• Set token to longer expiration (24 hours)

• User controller have to return JSON not string:
  For example: "message": "username already in use"