Update Breaking Changes list

Comply to README style

Merge branch 'master' into add-more-seeds

Update README

Add permissions to user/group initializers ...

Thank you @bdlamprecht for researching how to add permissions to
users and groups in #92.

Fixes #92

Update README.md

✏️ Listed one more breaking change

✏️ Mention update to Alpine 3.8

✏️ Added nginx troubleshooting section

✨ Use a default Redis password ...

Although it does not provide any additional security, it shows how to
configure Redis with a password and how to use Netbox using a password
protected redis server. Something that might be considered in a classic
production deployment. (But is mostly irrelevant in e.g. a Kubernetes /
OpenShift deployment as the isolation is usually on a network level.)

♻️ Make netbox-worker it's own container ...

One container should ideally have one responsibility [1]. Therefore I
implemented the netbox-worker to start in it's own container. This is
possible, because netbox and the worker communicate via redis anyway.

They still use the same image underneath, just the "command" they
execute while starting different.

Or in other words: I see no reason to introduce supervisord, when we
already have docker-compose which can take care of running multiple
processes.

Also, here's another benefit: Now it's possible to view the logs of the
webhook worker independently of the other netbox logs (and vice-versa).

Other changes in this commit:
* I don't see a reason to put a password for Redis in the docker-compose
  setup, so I removed it.
* Slightly changed the nginx config, so that the nginx startup command
  becomes simpler and any error should be visible in the docker log.
* Some housekeeping in the `Dockerfile`.
* Added some troubleshooting advice regarding webhooks to the README.

I'd like to thank Brady (@bdlamprecht [2]) here who did the harder
work of figuring out what's even required to have webhooks working. [3]

[1] 
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#decouple-applications
[2] https://github.com/bdlamprecht
[3] https://github.com/ninech/netbox-docker/pull/90

use docker-compose.yml instead of docker-compose.test.yml

Bump version to 0.3.0 and add line in README describing the breaking change.

Implement fix for field 'filterable' that was broken. Added new custom field parameter 'filter_logic'

Fix typo

⬆️ Version increment ...

Because of a braking change.

Move config to /etc/netbox/config (Fixes #54) ...

With this the configuration is moved to /etc/netbox/config and the
default reports directory is set to /etc/netbox/reports. This enables
the user to mount reports from a config map or persistent volume in
OpenShift.

✏️ Version ≠ Version

✨ Introduces a Netbox Docker project version

✏️ Moved NAPALM section ...

... and rephrased it a bit.

✏️ Moved ldap info into Version section

✏️ Made production instructions more prominent

✏️ Netbox -> NetBox

Updating README.md to describe NAPALM settings.

Add django_ldap_auth ...

In the ldap.Dockerfile the django_ldap_auth module is installed to
enable authentication againt LDAP servers.

✏️ OpenShift Issues were resolved ...

Thanks to #47 Netbox seems not fit for OpenShift as well.

✏️ Cosmetics

Modifications for Openshift ...

With these modifications the netbox containers can run on Openshift.
The configuration files can be imported from a config map to the
'/etc/netbox' directory and will be loaded from there.

✨ Include Initializers ...

Initializers are startup scripts for common tasks like creating custom
fields. These are problems many users of Netbox Docker potentially face
and are therefore worth sharing.

Update README.md ...

Fix url for K8s configmap, old url was 404