Remove recipes and classes included in dylan and update README

* last revision of this layer was retained in danny branch
  (contains backports from dylan to danny).
* remove all classes and recipes, so that we can reuse this
  layer later for backports from newer version and to prevent
  people accidentally including this in dylan builds

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: If3ec7101dc0688a472b2eb550fb76846972beeaf
Reviewed-on: https://g2g.palm.com/2270
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>