Added BlockCanBuild Event. Fixed Event enumeration

src/org/bukkit/event/block/BlockCanBuildEvent.java

@@ -0,0 +1,28 @@
+/**
+ * 
+ */
+package org.bukkit.event.block;
+
+import org.bukkit.Block;
+import org.bukkit.event.Cancellable;
+
+/**
+ * @author durron597
+ */
+public class BlockCanBuildEvent extends BlockEvent implements Cancellable {
+	protected boolean cancel;
+	
+	public BlockCanBuildEvent(Type type, Block block) {
+		super(type, block);
+	}
+	
+	@Override
+	public boolean isCancelled() {
+		return cancel;
+	}
+
+	@Override
+	public void setCancelled(boolean cancel) {
+		this.cancel = cancel;
+	}
+}