Enable rebase to continue for all rebase stages

EGit should be able to continue a rebase started by C Git.

Change-Id: I63058026295fec34157b5687ae87ae9cb0c27c86
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java

@@ -723,6 +723,9 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 			// these operations are only possible while in a rebasing state
 			switch (repo.getRepositoryState()) {
 			case REBASING_INTERACTIVE:
+			case REBASING:
+			case REBASING_REBASING:
+			case REBASING_MERGE:
 				break;
 			default:
 				throw new WrongRepositoryStateException(MessageFormat.format(