Broke apart check_for_error to resolve #15

CodeClimate issue:
https://codeclimate.com/github/Yelp/yelp-ruby/Yelp::Error
Merge branch 'develop' into feature/refactor-check-for-error
Merge pull request #16 from Yelp/feature/refactor-check-for-error

Broke apart check_for_error to resolve #15