fix javadoc.

M
Merge pull request #97 from msimonin/fixJavadoc

fix javadoc.
fix changelog.

M
prepare release (deb package).
update release plugin.

M
[maven-release-plugin] prepare release snoozenode-2.1.5
[maven-release-plugin] prepare for next development iteration
post release.
Merge branch 'maint-2.1.0'

Conflicts:
	distributions/deb-package/build.sh
	distributions/deb-package/snoozenode/debian/changelog
	pom.xml