OR-605 Fix findAndUpdate addressbook call
OR-592 Update documentation
OR-592 Refactor targets for POST /api/notifications

* Change notification target array :
`target: [ {objectType: 'user|community', id: '1234'} ]`
* Fix tests
OR-592 Add tests for notification target communities
OR-228 handle search error on the client
OR-228 Add missing entry
OR-613 Refactor css class for the central panel

* Change `.widget` to `.esn-panel`
* `.widget` only use for widget to the left
Merge pull request #410 in OR/rse from OR/rse-chamerling:OR-228 to master

* commit 'da9f1de6a2eac656c36b5c6fca90ced839fd18b6':
  OR-228 Add missing entry
  OR-228 handle search error on the client
Merge pull request #394 in OR/rse from ~RPIGNOLET/rse:OR-592 to master

* commit '1e0dfacfbb6ad30333e28e48a8821a39572e3c27':
  OR-592 Add tests for notification target communities
  OR-592 Refactor targets for POST /api/notifications
  OR-592 Update documentation
Merge pull request #406 in OR/rse from OR/rse-chamerling:OR-605-fixgoogleimport to master

* commit 'd2398f34d833929c612f94789ae91551dd2c52f2':
  OR-605 Fix findAndUpdate addressbook call
Merge pull request #411 in OR/rse from ~RPIGNOLET/rse:OR-613 to master

* commit 'b6c1e352928ab83642d03bfe07bec87c1632ee9d':
  OR-613 Refactor css class for the central panel
OR-608 fix typo in backend/webserver/index.js. webserver.server -> server
Merge pull request #415 in OR/rse from ~SLEMAISTRE/rse:OR-608 to master

* commit 'bc587be49761f397f23825c39739a526d9a65a84':
  OR-608 fix typo in backend/webserver/index.js. webserver.server -> server