Applied comments from PR and more

Changes:
* timeline plugin got removed REST resource (old restlet1x ones),
  those are moved to restlet1x plugin
* timeline plugin now has two concerns: the TL store backed with KZ
  and "recording" (TBD cleanup)
* timeline does not depend anymore on restlet1x, it's other way around
  basically letting us implement new feeds that are not based on
  restlet1x or rome.
* restlet1x got the feed implementations.