SPA: implement a small abstraction for Worker ports
Worker: move the server abstraction to the spa directory
SPA: Implement the Talkilla SPA
SPA: add a DummyWorker to simulate a proper Worker
SPA: implement a SPA abstraction for the frame worker
Include the SPA tests to the automated frontend tests
Worker: use the new SPA abstraction
Worker: fix the the tests
Fix tests
Fix tests
SPA: move spa.js to the worker directory
Improve seperation of import
Fix jshint error
Fix duplicated global declaration
Worker: SPA does not take any options (for now)
TalkillaSPA: the prototype is built via an object
Fix jshint error
SPA: instantiate the DummyWorker with an url
Simple feedback link implementation
Fix jshint errors