Add BaseConfig base class
Include merge_items helper for merging config lists and eliminating dupes
Define `LOG_REQUEST_ID_HEADER` for heroku config
Automatically configure installed apps and middleware for compressor, crispy forms, imagekit and sentry
Update s3 caching header and use Collectfast app for sppeding up static file collection
Include default config for django auth and django-allauth apps
Update logging config
Include default debug toolbar settings
Update docs for debug and auth apps
Rename base config class
Add Mozilla Content Security Policy config, split security settings for SSL and non-SSL sites
Update readme and requirements
Document MozillaCSP and DjangoSSLSecurity configs