Merge pull request #844 from ssogabe/JENKINS-18641

[FIXED JENKINS-18641] <st:bind> tag adds <script> tag. This extra tag caused syntax error if JQuery plugin enabled.

core/src/main/resources/lib/layout/progressiveRendering.jelly

@@ -38,5 +38,6 @@ THE SOFTWARE.
     <!-- TODO generate an ID so we can use this more than once per page -->
     <t:progressBar id="status" pos="0" tooltip="${tooltip ?: '%progressMessage'}"/>
     <j:invoke method="start" on="${handler}"/>
-    <script>progressivelyRender(<st:bind value="${handler}"/>, ${callback});</script>
+    <st:bind var="proxy" value="${handler}" />
+    <script>progressivelyRender(proxy, ${callback});</script>
 </j:jelly>