Move navigation app classes to a separate classes file

apps/project_tools/links.py

@@ -0,0 +1,9 @@
+from __future__ import absolute_import
+
+from django.utils.translation import ugettext_lazy as _
+
+from navigation import Link
+
+from .icons import icon_tool
+
+link_tools = Link(text=_(u'tools'), view='tools_list', icon=icon_tool)