reference-count

count references to resources and clean up after sweeps

Usage

``js
var Context = require('reference-count');

var context = new Context();

context.on('resource', function(resource) {
// called anytime there is a new resource counted
});

context.on('garbage', function(resource) {
// clean up the resource here
});

context.sweep('actor1')
.count('resource1')
.count(['resource2', 'resource3'])
.done();

context.sweep('actor1')
.count('resource1')
.count('resource2'])
.done();

context.destory('actor1');
``