Init

Here's my first stab at joining in on the high_five gem.

refactored init task to take advantage of Thor::Actions.

I had some initial file-path problems running bin/hi5 so I add some path-magic found in other gems such as Heroku and shopify_api (both use Thor with executables)

In the future, I'd like to scrap this config/high_five.rb for a simple YAML file.