Implement CommandRef.toString() to help debugging

Change-Id: If3ebed08c8f4e2cc925a97dbdd4c84410bc7c4a5
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CommandRef.java

@@ -165,4 +165,12 @@ public class CommandRef {
 		r.setCommandName(getName());
 		return r;
 	}
+
+	@SuppressWarnings("nls")
+	@Override
+	public String toString() {
+		return "CommandRef [impl=" + impl + ", name=" + name + ", usage="
+				+ CLIText.get().resourceBundle().getString(usage) + ", common="
+				+ common + "]";
+	}
 }