Add simple GameRegistry interface

Remove un-needed exception

src/main/java/org/spongepowered/api/Game.java

@@ -63,6 +63,13 @@ public interface Game {
      */
     EventManager getEventManager();
 
+    /**
+     * Gets the {@link org.spongepowered.api.GameRegistry}.
+     *
+     * @return The game registry
+     */
+    GameRegistry getRegistry();
+
     /**
      * Gets all currently loaded {@link org.spongepowered.api.world.World}s.
      *

src/main/java/org/spongepowered/api/GameRegistry.java

@@ -0,0 +1,23 @@
+package org.spongepowered.api;
+
+import org.spongepowered.api.block.Block;
+import org.spongepowered.api.item.Item;
+
+/**
+ * Provides an easy way to retrieve objects from the {@link org.spongepowered.api.Game} based on their ids.
+ */
+public interface GameRegistry {
+    /**
+     * Gets a {@link org.spongepowered.api.block.Block} by its identifier.
+     * @param id The id to look up
+     * @return The block or null if not found
+     */
+    Block getBlock(String id);
+
+    /**
+     * Gets an {@link org.spongepowered.api.item.Item} by its identifier.
+     * @param id The id to look up
+     * @return The item or null if not found
+     */
+    Item getItem(String id);
+}

src/main/java/org/spongepowered/api/plugin/PluginContainer.java

@@ -46,7 +46,7 @@ public interface PluginContainer {
     String getVersion();
 
     /**
-     * Returns the created instance of {@link org.spongepowered.api.plugin.Plugin}
+     * Returns the created instance of {@link org.spongepowered.api.plugin.Plugin}.
      * <p/>
      * TODO Provide a way to not dereference this back to Object
      *