JBIDE-17429 ensure consistent (updated) versions of org.jboss.tools.maven.apt.feature and org.sonatype.m2e.egit.feature across JBT/JBDS/Central target platforms
update README so it's more closely parallel w/ the JBoss Central version; add step4 for producing a p2diff report; if install fails, break
update README so it's more closely parallel w/ the JBoss Central version; add step4 for producing a p2diff report; if install fails, break