Fix cluster broadcast when emitting only to specified ids

[Ruby184]

Proposed changes

When I was playing with the cluster to implement PM2 support I realized that when using Socket.emitTo method, payload is sent to specified socket ids on current worker, but then broadcasted to other cluster workers and sent to all sockets - filtering of ids is not preserved. So I added these arguments to message broacasted by ClusterHop. Also I added an ability to specify ids ommited by broadcast. Examle:

// broacast to all sockets except the current one (socket.id)
socket.broadcast('event', 'data')
// broadcast to all except sockets with ids "id1" and "id2"
socket.broadcast('event', 'data', ['id1', 'id2'])
// also when using channel
channel.topic('topic').broadcast('event', 'data', ['id1', 'id2'])

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate)

Further comments

I will add tests just tell me if you are OK with the changes made. Thank you.

[coveralls]

Coverage decreased (-0.2%) to 93.484% when pulling 14d8696 on Ruby184:broadcast-fix into 27143fd on adonisjs:develop.