Update to OSBA 2.14

[lordinel]

Open Service Broker API was recently updated from version 2.13 to 2.14. Hence this checker needs to be updated to reflect the changes.

Another thing that I can suggest is to use tags so that it will be easier for developers to switch between broker API versions.

[leonwanghui]

The test framework has been refactored for easily extended by #71

[leonwanghui]

Hi @lordinel, currently we are trying to refactor the osb-checker framework with go language (please refer to #77 ), and now it's working. So if you want to test the spec with 2.14, please take a look at dev branch.

[leonwanghui]

@lordinel @mattmcneeney I think this issue is already fixed, please have a check with it.

[mattmcneeney]

Ah great, that's good to hear. You probably want to submit a PR to README.md in the main repo to show that the latest supported version is v2.14