[BREAKING] Change up cell selection.

In the PrisonerManager you can now provide either AnyCell or NoCell and
it'll select a cell or not based upon the provided one. This is breaking
because it changes the required types in the methods and the new cells
don't have anything implemented and throw exceptions.

src/main/java/com/graywolf336/jail/interfaces/ICell.java

@@ -0,0 +1,71 @@
+package com.graywolf336.jail.interfaces;
+
+import java.util.HashSet;
+
+import org.bukkit.Location;
+import org.bukkit.block.Chest;
+
+import com.graywolf336.jail.beans.Prisoner;
+import com.graywolf336.jail.beans.SimpleLocation;
+
+public interface ICell {
+    /** Gets the name of the cell. */
+    public String getName();
+    
+    /** Sets the prisoner in this cell. */
+    public void setPrisoner(Prisoner prisoner);
+    
+    /** Gets the prisoner being held in this cell. */
+    public Prisoner getPrisoner();
+    
+    /** Nullifies the prisoner data. */
+    public void removePrisoner();
+    
+    /** Returns true if there is currently a prisoner in this cell. */
+    public boolean hasPrisoner();
+    
+    /** Adds all the given signs to the cell. */
+    public void addAllSigns(HashSet<SimpleLocation> signs);
+    
+    /** Adds a sign to the cell. */
+    public void addSign(SimpleLocation sign);
+    
+    /** Returns all the signs for this cell. */
+    public HashSet<SimpleLocation> getSigns();
+    
+    /** Checks if there are any signs for this cell. */
+    public boolean hasSigns();
+    
+    /** Returns the entire list of signs in a string. */
+    public String getSignString();
+    
+    /** Sets the location of where the prisoner will be teleported at when jailed here. */
+    public void setTeleport(SimpleLocation location);
+    
+    /** Gets the teleport location where the prisoner will be teleported at when jailed here. */
+    public Location getTeleport();
+    
+    /** Sets the location of the chest. */
+    public void setChestLocation(SimpleLocation simpleLocation);
+    
+    /**
+     * Gets the location of the chest, returns null if no chest is stored at this cell.
+     * 
+     * @return The location of the chest, null if none.
+     */
+    public Location getChestLocation();
+    
+    /**
+     * Gets the chest for this cell, returns null if there is no chest or the location we have is not a chest.
+     * 
+     * @return The chest and its state.
+     */
+    public Chest getChest();
+    
+    /**
+     * Checks if the chest location doesn't equal null and if it is a double chest.
+     * 
+     * @return true if there is a chest, false if there isn't.
+     */
+    public boolean hasChest();
+}