First commit

@chadwpry, this is a pull request for, https://github.com/mentoring-nyc/mentor-match/issues/24, 
In the READ.me if someone could put a new line after, require 'rack_health_check', in the Installation section, that would be great.
Let's change this to require 'rack-health'

The rack-health.rb file should reference the rack/health.rb file.