Check queue when capacity/interval updated, add test

lib/defer-events.js

@@ -44,12 +44,14 @@ function deferEvents(eventsHash){
 function queueCapacity(num){
   if (!arguments.length) return this.queue.config.capacity;
   this.queue.config.capacity = num ? Number(num): 0;
+  this.queue.check();
   return this;
 }
 
 function queueInterval(num){
   if (!arguments.length) return this.queue.config.interval;
   this.queue.config.interval = num ? Number(num): 0;
+  this.queue.check();
   return this;
 }
 

test/unit/modules/defer-events-spec.js

@@ -95,4 +95,10 @@ describe('.deferEvent(s) methods', function() {
     this.client.recordDeferredEvents();
   });
 
+  it('should clear internal queue timer when .queueInterval() is set to 0', function(){
+    assert.ok(this.client.queue.timer);
+    this.client.queueInterval(0);
+    assert.isNull(this.client.queue.timer);
+  });
+
 });