Named the initialising function.

Given the plugin’s function the name $.crs(), so it can now be called
on demand.

source/crs.js

@@ -6,7 +6,10 @@
  * @url https://github.com/benkeen/country-region-dropdowns
  * @licence MIT
  */
-(function() {
+(function($) {
+
+	$.crs = function() {
+
 		"use strict";
 
 		var _countryClass = "crs-country";
@@ -412,4 +415,6 @@
 		// when the page has loaded, run our init function
 		_contentLoaded(window, _init);
 
+	}
+
 })();