Adding a dependency on the latest Grails Spock plugin
In preparation to the introduction of a base Spock integration test:
* Specified common itest functionality in JaxRsIntegrationTest.
* Moved default/common itest functionality to JaxRsIntegrationTestMixin so that it can be shared across base tests
Creating Spock integration test infrastructure
Relocating the test resources and providers to the src folder
Merge pull request #12 from noamt/spock-tests

Adding Spock integration test infrastructure