Remove setTimeout in favor of process.nextTick()

According to [process.nextTick() documentation](http://nodejs.org/api/process.html#process_process_nexttick_callback), using setTimeout is not recommended:

    On the next loop around the event loop call this callback. This is not a simple alias to setTimeout(fn, 0), it's much more efficient.

I'm not sure why you didn't use `nextTick()` yet, so if it was intended, please close :)
I'm currently testing this change and it seems to work better than with setTimeout.

What I'm unsure is the run function - it's not needed anymore imho.

lib/emitters/custom-event-emitter.js

@@ -3,18 +3,18 @@ var util         = require("util")
 
 module.exports = (function() {
   var CustomEventEmitter = function(fct) {
-    this.fct = fct
+    this.fct = fct;
+    var self = this;
+    process.nextTick(function() {
+      if (self.fct) {
+        self.fct.call(self, self)
+      }
+    }.bind(this));
   }
   util.inherits(CustomEventEmitter, EventEmitter)
 
   CustomEventEmitter.prototype.run = function() {
     var self = this
-
-    // delay the function call and return the emitter
-    setTimeout(function(){
-      self.fct.call(self, self)
-    }, 1)
-
     return this
   }