Add ClearwingNamespace, have Network, Channel, and User extend
Remove Network#emit()
Add ClearwingNamespace#on() and ClearwingNamespace#emit()
Tweak Clearwing#emit() error message
Add ClearwingNamespace#_namespace abstract private static property
Throw around some errors
Rework Clearwing#emit() errors
Fix tests
Fix Clearwing#emit() (for real)
Update tests