SLING-3051 : updated maven plugin and dependency versions of maven-scr-plugin and org.apache.felix.scr.annotations to work properly with m2eclipse (otherwise complains about lifecycle-mapping for scr goal not being mapped, and with these versions it works perfect). Plus adjusting the outputDirectory as suggested in SLING-3019

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1521475 13f79535-47bb-0310-9956-ffa450edef68