Remove Hound configuration (#33)

Usage of Hound has been replaced by a Travis task that runs `npm run
lint`

.hound.yml

-coffeescript:
-  enabled: false
-javascript:
-  config_file: .jshintrc
-  ignore_file: .jshintignore
-jscs:
-  enabled: false
-  config_file: .jscsrc
-ruby:
-  enabled: false
-scss:
-  enabled: false