Makes sdt depend on kepler jdt
Sign only the jars we generate
Merge pull request #739 from skyluc/issue/jdt-kepler-dependency

Makes sdt depend on kepler jdt
Merge branch 'master' into platform/luna

Conflicts:
	org.scala-ide.sdt.core/resources/META-INF/MANIFEST-2_10.MF
	org.scala-ide.sdt.core/resources/META-INF/MANIFEST-2_11.MF