Bump parent poms to 4.1.2

Signed-off-by: Fred Bricon <fbricon@gmail.com>
Bump maven plugins to 1.5.5-SNAPSHOT

Signed-off-by: Fred Bricon <fbricon@gmail.com>
Bump central plugins to 1.2.4-SNAPSHOT

Signed-off-by: Fred Bricon <fbricon@gmail.com>
Bump example plugins to 1.5.4-SNAPSHOT

Signed-off-by: Fred Bricon <fbricon@gmail.com>