Add support for auto importing dependecies

- No need to use: from .dependencies import *  # NOQA

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/dependencies/classes.py

@@ -2,6 +2,8 @@ from __future__ import print_function, unicode_literals
 
 import fileinput
 import json
+from importlib import import_module
+import logging
 import pkg_resources
 import shutil
 import sys
@@ -158,6 +160,18 @@ class DependencyGroupEntry(object):
 class Dependency(object):
     _registry = {}
 
+    @staticmethod
+    def initialize():
+        for app in apps.get_app_configs():
+            try:
+                import_module('{}.dependencies'.format(app.name))
+            except ImportError as exception:
+                if force_text(exception) not in ('No module named dependencies', 'No module named \'{}.dependencies\''.format(app.name)):
+                    logger.error(
+                        'Error importing %s dependencies.py file; %s', app.name,
+                        exception
+                    )
+
     @staticmethod
     def return_sorted(dependencies):
         return sorted(dependencies, key=lambda x: x.get_label())