Document the ResourceEvent
Document the ResourceEvent

- Not documenting the listener, as that should work primarily behind the
  scenes.

nocvp/zf-api-problem,Wilt/zf-rest,weierophinney/zf-api-problem,rstgroup/zf-api-problem,Cube-Solutions/zf-hal,Cube-Solutions/zf-hal,vixriihi/zf-jsonld,Wilt/zf-hal,weierophinney/zf-api-problem,Cube-Solutions/zf-hal,nobesnickr/zf-hal,weierophinney/zf-api-problem,rstgroup/zf-api-problem,nocvp/zf-rest,rstgroup/zf-api-problem