Include creation time in LocalAuthor.

This allows the oldest LocalAuthor to be used as the default.

briar-api/src/org/briarproject/api/LocalAuthor.java

@@ -4,15 +4,21 @@ package org.briarproject.api;
 public class LocalAuthor extends Author {
 
 	private final byte[] privateKey;
+	private final long created;
 
 	public LocalAuthor(AuthorId id, String name, byte[] publicKey,
-			byte[] privateKey) {
+			byte[] privateKey, long created) {
 		super(id, name, publicKey);
 		this.privateKey = privateKey;
+		this.created = created;
 	}
 
 	/**  Returns the private key used to generate the pseudonym's signatures. */
 	public byte[] getPrivateKey() {
 		return privateKey;
 	}
+
+	public long getTimeCreated() {
+		return created;
+	}
 }