Develop (musonza#50)

* Custom notifications, broadcast (musonza#44)

* check for notifications config

* add broadcasting option

* return unread messages count

* get message by id (musonza#49)

version 2.1.0

Get common conversations among multiple users

Merge pull request musonza#27 from pxgamer/laravel_auto_discovery

Add Laravel 5.5 auto-discovery

update docs

Update Conversation Timestamp

version 0.1