Version updated to 2.1.0

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Copyright for debian updated

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Changelog for debian updated

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Merge pull request #91 from vogel/release-2.1.0

Release 2.1.0