The aerogear-sync-server [1] repository contains a single server implementation which is based on the 409 Conflict handling which is now also available via the Forge plugin. So I'd like to remove the rest server. 

There was also some early differential synchronization work done [2] which is out dated and could be removed.

For those interested the experimental work that Luke and I have been working on is in this branch [3] and I'd be happy to push it. 

Any objections?