#50 Enum to track state of Token Ingestion

ace-am/src/main/java/edu/umiacs/ace/monitor/register/IngestState.java

+package edu.umiacs.ace.monitor.register;
+
+/**
+ * Little state holder
+ *
+ * @author shake
+ */
+public enum IngestState {
+    QUEUED, NEW, UPDATED, MATCH
+}