Merge pull request #7 from mmz-srf/feature/allow-multiple-dns-servers-to-be-pushed

Allow to supply an array of dns servers to be pushed via dhcp-option
Merge pull request #9 from mmz-srf/feature/make-certificate-revocation-list-configurable

Make it possible to configure a certificate revocation list
Merge pull request #8 from mmz-srf/feature/add-option-dev-type

Allow to configure the dev-type openvpn should use
Merge remote-tracking branch 'upstream/master' into develop