Updated dependencies: replaced outdated ripienaar/concat with puppetlabs/concat.
Improvements in OMD installation: omd and apache2 service name can be customized (the OMD package name may vary between repositories). Declaration of Apache can be disabled to avoid conflicts if it is already installed with another module like example42/apache.
Improvements in agent setup: agents can be connected by ip addresses (automatically populates the 'ipaddresses' map in main.mk). Fixed package names and added support for dpkg provider for Debian Wheezy. Fixed error in host.pp when host_tags array contained only one element.
Fixed error when all_hosts_static were not defined.
Updated readme