JBIDE-16738 move to Luna M6, put back missing features (mylyn.github, egit.mylyn; add m2eclipse-egit (JBDS-2943); update 3rd party stuff to latest versions: eclipsecs 5.7.0, pmd 4.0.2, ajdt 2.2.4, spring ide 3.5.0.201403, subclipse 1.10.4 / svnkit 1.8.4, NEWER testng 6.8.6, vjet 0.10.0.201402, findbugs 2.0.3 >> master