Read user-token from the config file

A user can find his/her's user-token by executing the following command:

    read -p "Username: " USER && read -s -p "Password: " PASS && curl --request POST -d "login=$USER&password=$PASS" https://8tracks.com/sessions.xml

The value in the `<user-token>` tag should be placed inside the `.config/orochi/config.json` file
with the key "user-token".
Merge branch 'master' of https://github.com/jeremija/orochi