diff --git a/HISTORY.rst b/HISTORY.rst
index 9d70804d28..f329200ee1 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -111,6 +111,41 @@
   The maximum size of the document cache is controlled
   by the new DOCUMENTS_CACHE_MAXIMUM_SIZE setting.
   This setting defaults to 500 megabytes.
+- Add support for post edit callbacks to settings. This
+  callback willl execute when a settings's value is changed.
+- Switch to full app paths. Instead of inserting the path
+  of the apps into the Python app, the apps are now
+  referenced by their full import path. This avoid app name
+  clashes with external or native Python libraries.
+  Example: Mayan statistics app vs. Python new statistics library.
+  Every app reference is now prepended with 'mayan.apps'.
+  Existing config.yml files need to be updated manually.
+- Added a colorized console log formatter. New log formatter
+  that colors the output depending on the log level of the
+  message. The default palette handles: INFO, SUCCESS, ERROR,
+  DEBUG and CRITICAL.
+- Decreased the thumbnail fade-in duration. Reduce the
+  document thumbnail fadein animation length to speed up
+  display of resolved thumbnails. Seems to reduce browser
+  load in FireFox.
+- Document stubs are now filtered from the search results.
+- Replaced deprecated string_concat in preparation for an
+  eventual Django 2.x upgrade.
+- Removed the converter's base64 image support as it was
+  no longer being used by any stock app.
+- Removed the SIGNATURES_GPG_HOME settings. The GPG keys 
+  are no longer stored in disk but in the database itself
+  making this setting obsolete. This changed happened 
+  several versions ago and this removal doesn't affect 
+  any code path.
+- Added two new settings to the django_gpg app: 
+  SIGNATURES_GPG_BACKEND and SIGNATURES_GPG_BACKEND_ARGUMENTS.
+  These settings allow changing the GPG backend that the 
+  app will use.
+- Removed the settings SIGNATURES_GPG_PATH. The path to the
+  GPG binary is now passed via the
+  SIGNATURES_GPG_BACKEND_ARGUMENTS.
+
 
 3.1.9 (2018-11-01)
 ==================
diff --git a/mayan/apps/django_gpg/classes.py b/mayan/apps/django_gpg/classes.py
index 494fe86438..61c3ebc254 100644
--- a/mayan/apps/django_gpg/classes.py
+++ b/mayan/apps/django_gpg/classes.py
@@ -10,7 +10,8 @@ from mayan.apps.common.utils import mkdtemp
 
 
 class GPGBackend(object):
-    def __init__(self, **kwargs):
+    def __init__(self, gpg_path, **kwargs):
+        self.gpg_path = gpg_path
         self.kwargs = kwargs
 
 
@@ -76,7 +77,7 @@ class PythonGNUPGBackend(GPGBackend):
         os.chmod(temporary_directory, 0x1C0)
 
         gpg = gnupg.GPG(
-            gnupghome=temporary_directory, gpgbinary=self.kwargs['binary_path']
+            gnupghome=temporary_directory, gpgbinary=self.gpg_path
         )
 
         result = function(gpg=gpg, **kwargs)
diff --git a/mayan/apps/django_gpg/literals.py b/mayan/apps/django_gpg/literals.py
index 6af8911ce9..ab92dc32b2 100644
--- a/mayan/apps/django_gpg/literals.py
+++ b/mayan/apps/django_gpg/literals.py
@@ -2,6 +2,9 @@ from __future__ import unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
+DEFAULT_GPG_PATH = '/usr/bin/gpg1'
+DEFAULT_SETTING_GPG_BACKEND = 'mayan.apps.django_gpg.classes.PythonGNUPGBackend'
+
 KEY_TYPES = {
     'pub': _('Public'),
     'sec': _('Secret'),
diff --git a/mayan/apps/django_gpg/runtime.py b/mayan/apps/django_gpg/runtime.py
index 250373f711..2f6a38985e 100644
--- a/mayan/apps/django_gpg/runtime.py
+++ b/mayan/apps/django_gpg/runtime.py
@@ -1,10 +1,9 @@
 from django.utils.module_loading import import_string
 
-from .settings import setting_gpg_path
-
-# TODO: This will become an setting option in 2.2
-SETTING_GPG_BACKEND = 'mayan.apps.django_gpg.classes.PythonGNUPGBackend'
-
-gpg_backend = import_string(SETTING_GPG_BACKEND)(
-    binary_path=setting_gpg_path.value
+from .settings import (
+    setting_gpg_backend, setting_gpg_backend_arguments
 )
+
+gpg_backend = import_string(
+    dotted_path=setting_gpg_backend.value
+)(**setting_gpg_backend_arguments.value)
diff --git a/mayan/apps/django_gpg/settings.py b/mayan/apps/django_gpg/settings.py
index 0f7aff18aa..2aa72d7b6b 100644
--- a/mayan/apps/django_gpg/settings.py
+++ b/mayan/apps/django_gpg/settings.py
@@ -7,18 +7,23 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
+from .literals import DEFAULT_GPG_PATH, DEFAULT_SETTING_GPG_BACKEND
+
 namespace = Namespace(name='django_gpg', label=_('Signatures'))
-setting_gpg_home = namespace.add_setting(
-    global_name='SIGNATURES_GPG_HOME',
-    default=os.path.join(settings.MEDIA_ROOT, 'gpg_home'),
-    help_text=_(
-        'Home directory used to store keys as well as configuration files.'
-    ),
-    is_path=True
+
+setting_gpg_backend = namespace.add_setting(
+    default=DEFAULT_SETTING_GPG_BACKEND,
+    global_name='SIGNATURES_GPG_BACKEND', help_text=_(
+        'Path to the GPG class to use when managing keys.'
+    )
 )
-setting_gpg_path = namespace.add_setting(
-    global_name='SIGNATURES_GPG_PATH', default='/usr/bin/gpg1',
-    help_text=_('Path to the GPG binary.'), is_path=True
+setting_gpg_backend_arguments = namespace.add_setting(
+    global_name='SIGNATURES_GPG_BACKEND_ARGUMENTS',
+    default={
+        'gpg_path': DEFAULT_GPG_PATH
+    }, help_text=_(
+        'Arguments to pass to the SIGNATURES_GPG_BACKEND. '
+    )
 )
 setting_keyserver = namespace.add_setting(
     global_name='SIGNATURES_KEYSERVER', default='pool.sks-keyservers.net',