Minor fixes + code householding

- Fix SpawnCommandTest testing FirstSpawnCommand
- Fix javadoc errors
- Map TODO's to issue numbers where applicable
- Fix trivial TODO's

src/main/java/fr/xephi/authme/settings/SpawnLoader.java

@@ -141,9 +141,8 @@ public class SpawnLoader {
 
         World world = player.getWorld();
         Location spawnLoc = null;
-        // TODO ljacqu 20160312: We should trim() the entries
         for (String priority : spawnPriority) {
-            switch (priority.toLowerCase()) {
+            switch (priority.toLowerCase().trim()) {
                 case "default":
                     if (world.getSpawnLocation() != null) {
                         spawnLoc = world.getSpawnLocation();