Help mode is not obvious

[bruntonspall]

If you say help to the bot, it enters help mode (https://github.com/bruntonspall/xgovslackbot/blob/master/app/slack_bot.js#L378)
Once in help mode, you have to say "done" to get out of help mode, otherwise everything you say is only processed by the help processor. It's not obvious that this is happening.

Options for solving this include:
Making the content clearer what is going on
Changing to a Slack Dialog (https://api.slack.com/dialogs)
Investigating whether slack API can provide a prompt more easily.