Update target platform and 3rd party libs to latest orbit build

- use latest I-build for Luna
- use latest M-build for Kepler
- update javaewah to 0.7.9
- update org.apache.commons.compress to 1.6.0
- update com.jcraft.jsch to 0.1.50 for Kepler SR2

TODO: need to update to an R-build before releasing 3.3

Change-Id: I8e4e4d30f2c596b22b1a400f352396a543c74dcc
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Remove unused parameter in AbstractRebaseCommandHandler

Change-Id: I277ca21b99c4651b650bd17ea7359938faf7a57e
Update Luna target platform to use Luna M5 orbit repository

See http://dev.eclipse.org/mhonarc/lists/orbit-dev/msg03647.html

Change-Id: I3e361527be5ea28691b4773af2ee4e4bf1d0a8e6
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Avoid NPE when push refspec doesn't specify destination ref

If a push refspec omits :<dst>, the same ref as <src> will be updated.
See https://www.kernel.org/pub/software/scm/git/docs/git-push.html

Bug: 426067
Change-Id: Ia8bee28f0930373493835c74418dfb27ee98e36b
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>