Added ungleich app to extend Page models.

Ungleich app has a model called UngleichPage,
this model has an attribute called image_header
which will be used to set the background image for
the page header.

Signed-off-by: rscnt <rascnt@gmail.com>

ungleich/cms_toolbar.py

@@ -0,0 +1,25 @@
+from cms.extensions.toolbar import ExtensionToolbar
+from django.utils.translation import ugettext_lazy as _
+
+from cms.toolbar_pool import toolbar_pool
+from cms.toolbar_base import CMSToolbar
+
+from .models import UngleichPage
+
+
+@toolbar_pool.register
+class UngleichPageToolbar(ExtensionToolbar):
+    # defineds the model for the current toolbar
+    model = UngleichPage
+
+    def populate(self):
+        # setup the extension toolbar with permissions and sanity checks
+        current_page_menu = self._setup_extension_toolbar()
+        # if it's all ok
+        if current_page_menu:
+            # retrieves the instance of the current extension (if any) and the toolbar item url
+            page_extension, url = self.get_page_extension_admin()
+            if url:
+                # adds a toolbar item
+                current_page_menu.add_modal_item(_('Page Header'), url=url,
+                    disabled=not self.toolbar.edit_mode)