(refs #383)Disable "New Issue" button in the new issue creation page.

src/main/twirl/issues/create.scala.html

@@ -7,7 +7,7 @@
 @import view.helpers._
 @html.main(s"New Issue - ${repository.owner}/${repository.name}", Some(repository)){
   @html.menu("issues", repository){
-    @tab("", repository)
+    @tab("", true, repository)
     <form action="@url(repository)/issues/new" method="POST" validate="true">
     <div class="row-fluid">
       <div class="span9">