tycho 0.20, cleanup

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
[maven-release-plugin] prepare release tycho-support-0.0.13
[maven-release-plugin] prepare for next development iteration
takari namespace, added eclipse-repository, dropped feature and site

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>