release 0.3.3

Release 0.3.2

feat(handlers) allow for weak references (Kong#4)

This prevents the handlers registered to anchor any objects, and hence preventing them from being garbage collected.
When registering event handlers using the new `register_weak` method, the caller must anchor the handlers. If not, the handler will be GC'ed and will stop receiving/handling events.

release 0.3.0

prep rockspec for release

Updated rockspec for release 0.1.0