Prepare for publishing to oss.sonatype / Maven-Central

Per
https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide?__utma=53622698.1251237259.1395091521.1395091521.1395091521.1&__utmb=53622698.19.10.1395091521&__utmc=53622698&__utmx=-&__utmz=53622698.1395091521.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)&__utmv=-&__utmk=163933307#SonatypeOSSMavenRepositoryUsageGuide-11.WhatDoPeopleThinkAboutOSSRH
add more boilerplate required by sonatype