Set up config file for API key avoids exposure

You copy config.rb.example to config.rb and add your private information
there instead of potentially leaking to the repository.
Removed puts in config
removed String#+ calls where they don't make sense
Updated program to run from bin
Merge branch 'master' of SatishTalim/weather-bot

* 'master' of https://github.com/SatishTalim/weather-bot:
  commit
  commit

Conflicts:
	Gemfile
	Gemfile.lock
	README.md
	lib/forecast/extract.rb