Update README.md

Extend fair warning in README

Fix notificationcommand template

Add custom_prepend and custom_append parameter to object/host.pp and

Add docu sample for icinga2::object::user

Fix grammar mistake

extend hiera documentation

add switch for yum base url to repo class when os is amazon linux

Add Amazon Linux to supported OS in params class

Bump puppet-lint version

fix puppet lint config

Clean up database documentation and add tests

fix false id

fix minor docu issues

Fix the checkcommand template vars attribute handling