Sets version range boundaries on egit and jgit

Egit/jgit 3.0 introduces API breaking changes. This commit excludes
3.x.

Closes https://bugs.eclipse.org/bugs/show_bug.cgi?id=405063
Kepler SR2 changes to RMAP
Adds local.build.properties file suitable for building on dev machines
Buckminster builds should not produce source bundles as singletons

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=429797
Merge branch 'juno-maintenance'
Merge remote-tracking branch 'origin/master' into luna

Conflicts:
	org.eclipse.buckminster.releng/build.rmap

Change-Id: I548e6f2b4edcfe3875d81f4f195befbebc152153
Signed-off-by: Lorenzo Bettini <lorenzo.bettini@gmail.com>