add coveralls
Update README.md
update readme
Update listing.rb
added service catelog api to yoolk api.
Merge pull request #2 from yoolk/add_service_catalog

added service catelog api to yoolk api.
update ruby version
[Finishes #62607738] add business photo api
[Finishes #62607738] update README
[#62607738] remove unused code
Merge pull request #3 from yoolk/62607738_add_business_photo_api

[Finishes #62607738] add business photo api
Merge branch 'master' into add_instant_website

Conflicts:
	README.md
	lib/yoolk_api.rb
	lib/yoolk_api/resources/listing.rb
	spec/lib/listing_spec.rb