added IIFE wrappers to avoid global variables

this essentially creates self-contained modules cf. http://benalman.com/news/2010/11/immediately-invoked-function-expression/
FND · Sep 14, 2013 · 7b6b753 · 7b6b753
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diff --git a/lib/main.js b/lib/main.js
@@ -1,3 +1,5 @@
+(function() {
+
 var contacts = jQuery("ul.contacts");
 var filterField = jQuery('<input type="search" />').insertBefore(contacts).
 	on("keyup", onFilter);
@@ -21,3 +23,5 @@ function onFilter(ev) {
 		}
 	});
 }
+
+}());
diff --git a/test/test_filtering.js b/test/test_filtering.js
@@ -1,3 +1,5 @@
+(function() {
+
 QUnit.module("contacts filtering");
 
 QUnit.asyncTest("filtering by initials", function() {
@@ -25,3 +27,5 @@ function extractNames(items) {
 	});
 	return Array.prototype.slice.call(names);
 }
+
+}());