[Fix #17] messageSubscribers should be mutable array.
[Fix #17] messageSubscribers should be mutable array.

baxrob/quark-shell-mac,xhacker/quark-shell-mac,HackPlan/quark-shell-mac,HackPlan/quark-shell-mac,baxrob/quark-shell-mac,xhacker/quark-shell-mac,xhacker/quark-shell-mac,baxrob/quark-shell-mac