Javadoc improvements

Fix #633

Illegal usage of the work 'implementation'
docs revise
Adds missing statistics-enabled in xsd and parser
ICountDownLatch: improved javadoc about reason the await() is missing
Merge pull request #641 from pveentjer/improvement/3.0/633-icountdownlatch-javadoc

Javadoc improvements
Merge pull request #643 from pveentjer/fix/3.0/statistics-enabled-missing-from-xsd

Adds missing statistics-enabled in xsd and parser
CloudUtility: tagkey and securitygroup log messages are mixed up. Also a minor code improvement
Merge pull request #647 from pveentjer/fix/3.x/aws-logging-fix

Fix/3.x/aws logging fix
fixes #648
Merge remote-tracking branch 'origin/3.0' into 3.0
fixes #650