Store updated channels/patterns in subscription actor

[ryanlecompte]

Looks like we were just filtering and never re-assigning the result. :-)

[etaty]

Good catch :)
I think we should use filterNot instead of filter
And use var instead of val for channelsSubscribed and patternsSubscribed
And put some tests haha

I let you fix your commit ;)

[ryanlecompte]

Sorry about that! I just sent an update. I ended up switching the subscriber/patterns to sets to avoid any issues with duplicate subscriptions. I think it also simplified the code a bit. I also added some unit tests for this behavior.

[coveralls]

Coverage remained the same when pulling ccf6f08 on ryanlecompte:master into 631c37f on etaty:master.

[etaty]

thanks