Add option to disable jails entirely.

Essentials/src/com/earth2me/essentials/Essentials.java

@@ -232,8 +232,11 @@ public class Essentials extends JavaPlugin implements IEssentials
 		pm.registerEvents(worldListener, this);
 
 		//TODO: Check if this should be here, and not above before reload()
+		if (settings.isJailsEnabled())
+		{
 			jails = new Jails(this);
 			confList.add(jails);
+		}
 
 		pm.registerEvents(tntListener, this);
 
@@ -428,10 +431,17 @@ public class Essentials extends JavaPlugin implements IEssentials
 	}
 
 	@Override
-	public IJails getJails()
+	public IJails getJails() throws UnsupportedOperationException
+	{
+		if (jails == null)
+		{
+			throw new UnsupportedOperationException("Jails are not enabled in your configuration");
+		}
+		else
 		{
 			return jails;
 		}
+	}
 
 	@Override
 	public Warps getWarps()

Essentials/src/com/earth2me/essentials/IEssentials.java

@@ -37,7 +37,7 @@ public interface IEssentials extends Plugin
 
 	BukkitScheduler getScheduler();
 
-	IJails getJails();
+	IJails getJails() throws UnsupportedOperationException;
 
 	Warps getWarps();
 

Essentials/src/com/earth2me/essentials/ISettings.java

@@ -173,4 +173,6 @@ public interface ISettings extends IConf
 	long getTeleportInvulnerability();
 	
 	boolean isTeleportInvulnerability();
+
+	boolean isJailsEnabled();
 }

Essentials/src/com/earth2me/essentials/Settings.java

@@ -780,4 +780,10 @@ public class Settings implements ISettings
 	{
 		return teleportInvulnerability;
 	}
+
+	@Override
+	public boolean isJailsEnabled()
+	{
+		return config.getBoolean("enable-jails", true);
+	}
 }

Essentials/src/com/earth2me/essentials/metrics/MetricsStarter.java

@@ -171,6 +171,9 @@ public class MetricsStarter implements Runnable
 
 			metrics.start();
 
+		}
+		catch (UnsupportedOperationException ex)
+		{
 		}
 		catch (Exception ex)
 		{

Essentials/src/config.yml

@@ -44,6 +44,9 @@ change-displayname: true
 # Don't forget to remove the # infront of the line
 #add-prefix-suffix: false
 
+# Whether or not jails are activated
+enable-jails: true
+
 # The delay, in seconds, required between /home, /tp, etc.
 teleport-cooldown: 0