AEROGEAR-1058 Accept header matching

This can be tested using aerogear-controller-demo and all of the following calls should succeed:

```curl -i --header "Accept: application/json" "http://localhost:8080/aerogear-controller-demo/cars/1"```

```curl -i --header "Accept: application/*" "http://localhost:8080/aerogear-controller-demo/cars/1"```

```curl -i --header "Accept: */*" "http://localhost:8080/aerogear-controller-demo/cars/1"```