Marking as a bug, because it's a security issue. Very easy to fix, but still a security issue.
auth: remove default value for salt and token key
Related to #280. I will close the issue after I fix the loadConfig
dependency and update the docs.
auth: call loadConfig in proper places
Calling it in init won't always work. This tsuru.conf file may load
after the init is called, and it would panic.
Related to #280.
docs/config: update docs related to auth settings