Adyen Ruby API Library 1.1.0
Fixes:
- Update gemspec and Gemfile to include more information
- Add merchant-specific url support to all services, fix webmock dep, add deps to Gemfile
- Remove ruby version from Gemfile
- Tweaks to travis and Gemfile
- Switch testing from rake to rspec
- Remove jruby testing
- #8 Set CheckoutUtility URL