Added equals implementations on model classes.

src/main/groovy/com/jdbernard/nlsongs/model/Token.groovy

@@ -2,10 +2,26 @@ package com.jdbernard.nlsongs.model
 
 public class Token implements Serializable {
 
+    public static final long EXPIRY_WINDOW = 1000 * 60 * 60 * 24;
+
     String token
     User user
     Date expires
 
+    public Token(Map namedArgs) {
+        if (!namedArgs.user) throw new IllegalArgumentException(
+            "Cannot create Token object: missing user property.")
+
+        if (namedArgs.expire) this.expires = namedArgs.expires
+        else this.expires = new Date((new Date()).time + EXPIRY_WINDOW)
+
+        if (namedArgs.token) this.token = namedArgs.token
+        else this.token = UUID.randomUUID().toString() }
+
+    public Token(User user) { this([user: user]) }
+
+    public void refresh() { this.expires = new Date((new Date()).time + EXPIRY_WINDOW) }
+
     @Override
     public boolean equals(Object thatObj) {
         if (thatObj == null) return false