Add tinder overriding option by config

This PR allows to override tinder options used in room listen method.

For example in `lita_config.rb` you can do


```ruby
config.robot.adapter = :campfire

config.adapter.subdomain = ENV["CAMPFIRE_SUBDOMAIN"]
config.adapter.apikey = ENV["CAMPFIRE_APIKEY"]
config.adapter.rooms = ENV["CAMPFIRE_ROOMS"].split(',')
config.adapter.debug = false
config.adapter.tinder = { timeout: 30, user_agent: 'lita-campfire' }
```