Before this change, we were looking for config files in
default locations in source control, which is not a good
place to look for them. Now `run.py` and friends have a
command line argument where users can specify the config
files.
Note that the change to server.py is only a partial fix
to make it so that bots that don't use third party config
files won't crash. That program needs an overhaul, anyway.
This adds support to check and raise a BadRequest when either the
configuration of bot couldn't be found or the BotHandler code of bot
couldn't be fetched. There can be cases where flaskbotrc contains config
details of a bot, but the user hasn't added it's handler class code. This
fixes server to handle such cases, by reporting it to user.
This also fixes the response of bot server to make it possible to skip
the response message.
