Rename to signal-cli

Changes experimental dbus interface from
org.asamk.TextSecure to org.asamk.Signal

src/main/java/org/asamk/signal/GroupNotFoundException.java

@@ -0,0 +1,14 @@
+package org.asamk.signal;
+
+import org.freedesktop.dbus.exceptions.DBusExecutionException;
+
+public class GroupNotFoundException extends DBusExecutionException {
+
+    public GroupNotFoundException(String message) {
+        super(message);
+    }
+
+    public GroupNotFoundException(byte[] groupId) {
+        super("Group not found: " + Base64.encodeBytes(groupId));
+    }
+}