Modify kbox to not call open() when already open.

This was causing a bug in which if you click the button that opens the
kbox when the kbox was open, and closeOnOutClick is True, the kbox would
be permanently closed, and would not open again.

media/js/kbox.js

@@ -115,6 +115,7 @@ KBox.prototype = {
         self.rendered = false; // did we render out yet?
         self.$ph = false; // placeholder used if we need to move self.$el in the DOM.
         self.$kbox = $();
+        self.isOpen = false;
 
         // Make the instance accessible from the DOM element.
         self.$el.data('kbox', self);
@@ -176,6 +177,10 @@ KBox.prototype = {
             // we don't open anything.
             return;
         }
+        if (self.isOpen) {
+            return;
+        }
+        self.isOpen = true;
         self.rendered || self.render();
         self.$kbox.addClass('kbox-open');
         self.setPosition();
@@ -249,6 +254,10 @@ KBox.prototype = {
             // we don't open anything.
             return;
         }
+        if (!self.isOpen) {
+            return;
+        }
+        self.isOpen = false;
         self.$kbox.removeClass('kbox-open');
         self.options.modal && self.destroyOverlay();
         self.options.destroy && self.destroy();