Add cucumber documentation to readme.
Use multi_json
Remove require from Gemfile example
adds a readme example of returning headers
Merge pull request #12 from phillbaker/docs/cucumber-support

Add cucumber documentation to readme.
Merge pull request #13 from ryansch/use-multi-json

Use multi_json
Merge pull request #14 from ryansch/patch-1

Remove require from Gemfile example
Merge pull request #16 from chochkov/headers_into_readme

adds a readme example of returning headers
Ignore ruby-version.
Version bump.