text: define(['$','BL/Blink/_/main'], function ($) {
  
  	$.extend({
  
  		ready: function(callback) {
  			if (document.readyState === "complete" || document.readyState === "loaded"||document.readyState==="interactive") 
  				callback();
  			else
  				document.addEventListener("DOMContentLoaded", callback, false);
  			return this;
  		},
  		
  		is:function(selector){
  			return !!selector&&this.filter(selector).length>0;
  		}
  
  	});
  	return $;
  });
  