Require cors-support on api-mock.cofee

    Fixes the following error:

      ```
    ReferenceError: CorsSupport is not defined
    ReferenceError: CorsSupport is not defined
        at new ApiMock (/Users/lucas.caro/checkout/apiv2blueprint/node_modules/api-mock/lib/api-mock.js:42:25)
        at Object.<anonymous> (/Users/lucas.caro/checkout/apiv2blueprint/node_modules/api-mock/bin/api-mock:85:13)
        at Module._compile (module.js:456:26)
        at Object.Module._extensions..js (module.js:474:10)
        at Module.load (module.js:356:32)
        at Function.Module._load (module.js:312:12)
        at Function.Module.runMain (module.js:497:10)
        at startup (node.js:119:16)
        at node.js:902:3
    ```