Merge pull request #23 from iceglow/DEVIDM-94

DEVIDM-94: Config improvements.
[maven-release-plugin] prepare release 1.0.23
[maven-release-plugin] prepare for next development iteration
Merge pull request #24 from iceglow/DEVIDM-94

DEVIDM-94: Let start take a ConfigHolder & print the config values.
DEVIDM-94: Throw exception on missing mandatory property.