Consolidate version_tag with project_tag

mayan/apps/common/templatetags/version_tags.py

@@ -1,15 +0,0 @@
-from __future__ import unicode_literals
-
-from django.template import Library
-from django.utils.importlib import import_module
-
-register = Library()
-
-
-@register.simple_tag
-def app_version(app_name):
-    try:
-        app = import_module(app_name)
-        return app.__version__
-    except ImportError:
-        return ''