Update for 1.1_01 renames.

We know these updates (can) break plugins bypassing Bukkit. They are needed for
smooth updates however. There will be another one right before before 1.1-R1.

src/main/java/net/minecraft/server/WorldData.java

@@ -162,7 +162,7 @@ public class WorldData {
         return this.spawnZ;
     }
 
-    public long f() {
+    public long getTime() {
         return this.time;
     }