Log errors in Service and ApplicationInstance
Remove exceptions from IBindingManagement interface.
BindingManagement calls IBindingManagement methods as Services.

This patch refactors BindingManagement so it now calls its own methods implementing IBindingManagement through a capability instance proxy.
This way, those methods will be executed as services, allowing other services to react to their execution by using observationService ;)
Fix APIConnector registration.

APIConnector now registers with ServiceFilterWithParams.
This IObservationFilter uses parameters of the observer service to invoke as parameters for the registered one.
Write correct url in api-testapp
Fix URL path. Must start with '/'
Commented code to check endpoint is accessible in APIConnectorTestApp.