Add internal API to manually invoke invitation manager.

src/main/java/io/kamax/mxisd/config/InternalAPIConfig.java

@@ -0,0 +1,24 @@
+package io.kamax.mxisd.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class InternalAPIConfig {
+
+    private final static Logger log = LoggerFactory.getLogger(InternalAPIConfig.class);
+
+    private boolean enabled = false;
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    public void build() {
+        log.info("--- Internal API config ---");
+        log.info("Internal API enabled: {}", isEnabled());
+    }
+}