Implementing syncro API. Remote projects could be syncronized wiht a
server.
- SyncRestApi: API connections to REST service
- ZamiaCitation: simplified Flora Citation. It'll be interchange class
between server and zamiaDroid. ZamiaCitation class is JSON marshaled.
- ProjectConfigControler: has new config pairvalue: projects'
lastModification.
- CitationDB has a new field. Timestamp with last modification