Replace django-celery with base Celery (#791)

Update celery tasks to new style & remove djcelery
Vanilla celery + django-celery-beat take over the role of djcelery. Task schedules are consolidated into settings instead of residing in code.
Update docs and example supervisor configs.

alliance_auth/settings.py.example

@@ -12,17 +12,12 @@ https://docs.djangoproject.com/en/1.10/ref/settings/
 
 import os
 
-import djcelery
-
 from django.contrib import messages
 from celery.schedules import crontab
 
-djcelery.setup_loader()
-
 # Celery configuration
 BROKER_URL = 'redis://localhost:6379/0'
-CELERYBEAT_SCHEDULER = "djcelery.schedulers.DatabaseScheduler"
-CELERYBEAT_SCHEDULE = dict()
+CELERYBEAT_SCHEDULER = "django_celery_beat.schedulers.DatabaseScheduler"
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -50,7 +45,7 @@ INSTALLED_APPS = [
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'django.contrib.humanize',
-    'djcelery',
+    'django_celery_beat',
     'bootstrapform',
     'authentication',
     'services',
@@ -237,6 +232,25 @@ NOCAPTCHA = True
 ##
 #####################################################
 
+
+#########################
+# CELERY SCHEDULED TASKS
+#########################
+CELERYBEAT_SCHEDULE = {
+    'run_api_refresh': {
+        'task': 'eveonline.tasks.run_api_refresh',
+        'schedule': crontab(minute=0, hour="*/3"),
+    },
+    'run_corp_update': {
+        'task': 'eveonline.tasks.run_corp_update',
+        'schedule': crontab(minute=0, hour="*/2"),
+    },
+    'update_all_corpstats': {
+        'task': 'corputils.tasks.update_all_corpstats',
+        'schedule': crontab(minute=0, hour="*/6"),
+    },
+}
+
 #################
 # EMAIL SETTINGS
 #################