Add reconnect api to allow mysql reconnect locations.

api/src/main/java/net/md_5/bungee/api/ReconnectHandler.java

@@ -0,0 +1,22 @@
+package net.md_5.bungee.api;
+
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+
+public interface ReconnectHandler
+{
+
+    /**
+     * Gets the initial server name for a connecting player.
+     *
+     * @param player the connecting player
+     * @return the server name
+     */
+    public String getServer(ProxiedPlayer player);
+
+    /**
+     * Save all pending reconnect locations. Whilst not used for database
+     * connections, this method will be called at a predefined interval to allow
+     * the saving of reconnect files.
+     */
+    public void save();
+}