Updating jQuery to 3.1.1.

Include Migrate plugin to be sure we don't break anything.
Chosen is currently impacted by harvesthq/chosen#2729 (nothing too serious atm)

source/demyo-web/src/main/java/org/demyo/web/velocity/tools/JavascriptTool.java

@@ -62,10 +62,11 @@ public String getCss() {
 		KNOWN_SCRIPTS = new HashMap<String, Script>();
 
 		addScript(new Script("TinyMCE", "vendor/tinymce/tinymce.min.js"));
-		addScript(new Script("Dialog-Polyfill", "vendor/dialog-polyfill.js"));
+		addScript(new Script("Dialog-Polyfill", "vendor/dialog-polyfill-0.4.6.js"));
 		addScript(new Script("Material", "vendor/material.min.js", KNOWN_SCRIPTS.get("Dialog-Polyfill")));
 		addScript(new Script("PrefixFree", "vendor/prefixfree.min.js"));
-		addScript(new Script("JQuery", "vendor/jquery-1.9.1.js"));
+		addScript(new Script("JQuery-Core", "vendor/jquery-3.1.1.min.js"));
+		addScript(new Script("JQuery", "vendor/jquery-migrate-3.0.0.js", KNOWN_SCRIPTS.get("JQuery-Core")));
 		addScript(new Script("Demyo.Core", "demyo_core.js", KNOWN_SCRIPTS.get("JQuery"),
 				KNOWN_SCRIPTS.get("Material"), KNOWN_SCRIPTS.get("PrefixFree")));
 		addScript(new Script("Chosen", "vendor/chosen.jquery.min.js", KNOWN_SCRIPTS.get("JQuery")));

source/demyo-web/src/main/webapp/WEB-INF/velocity/layout/default.vm

@@ -26,7 +26,7 @@ $quickTasks.prepare($javascript)
 		<link href="$link.contextPath/css/vendor/chosen.less" rel="stylesheet/less" type="text/css">
 		<link href="$link.contextPath/css/vendor/material.blue-pink.min.css" rel="stylesheet" type="text/css">
 		<link href="$link.contextPath/css/demyo.blue-pink.less" rel="stylesheet/less" type="text/css">
-		<script type="text/javascript" src="$link.contextPath/js/vendor/less.min.js"></script>
+		<script type="text/javascript" src="$link.contextPath/js/vendor/less-2.7.2.min.js"></script>
 		$javascript.load('Demyo.Core') ## Always load the core
 		$javascript.load('Demyo.QuickSearch') ## Always load quick search
 #foreach($source in $javascript.scriptSources)