[enh] Better JsonAttributeParser

[fix] Create DAO from the old old-in-one service

[enh] Refactor synchro action result, to be able to store deletes hits

[fix] Fix TU: add propagation delay after write operations

[es-core] Synchro now listen peers changes, throw WebSocket

- Synchro: generate user event from Synchro***Action

- Synchro: use scroll request
- Make sure maven using version >= 3.1

Upgrade to java 1.8
[core] Add config option to reload as part of the BC
[core] Fix unit test config file
[core] Peer: mark peers as DOWN is not alive since X time

Upgrade to java 1.8
[core] Add config option to reload as part of the BC
[core] Fix unit test config file
[core] Peer: mark peers as DOWN is not alive since X time