* add link to searchguard branch in README

* ELK Stack updated to 5.2, SearchGuard and Kibana plugins updated accordingly

* Fix typo (#92)

* Lockdown to the ELK components patch number

Fix line endings issue of shell script files on Windows

Added section about setup on windows to README.md

Explained line ending issue in kibana/entrypoint.sh on windows.

Feature: how-to logstash plugin management

Installed and configured the logstash-filter-json filter for message parsing in JSON out of the box.

Close #49.

Fix error "[9] System error: not a directory"

When starting the stack `with docker-compose up`, it gives out the error:

```
ERROR: Cannot start container e032695b38cdcd1c72597004f2369a7127b8233c9ecc2320c3b2bbd10209654b: [9] System error: not a directory
```