Store access token, scope, incoming webhook info, etc.

[dblock]

See dblock/slack-sup@3a497b4, there're two tokens returned via OAuth, one for the bot user and the other that has other requested oauth permissions. We need to store both in order to provide a token with other scopes than default bot scope.

https://api.slack.com/docs/oauth

{
    "access_token": "xoxp-XXXXXXXX-XXXXXXXX-XXXXX",
    "scope": "incoming-webhook,commands,bot",
    "team_name": "Team Installing Your Hook",
    "team_id": "XXXXXXXXXX",
    "incoming_webhook": {
        "url": "https://hooks.slack.com/TXXXXX/BXXXXX/XXXXXXXXXX",
        "channel": "#channel-it-will-post-to",
        "configuration_url": "https://teamname.slack.com/services/BXXXXX"
    },
    "bot":{
        "bot_user_id":"UTTTTTTTTTTR",
        "bot_access_token":"xoxb-XXXXXXXXXXXX-TTTTTTTTTTTTTT"
    }
}