Merge pull request #100 from wizjany/master

Added a method to check if a block is a rail

src/main/java/com/sk89q/worldedit/blocks/BlockType.java

@@ -520,6 +520,18 @@ public static boolean isRedstoneSource(int id) {
                 || id == 77; // Button
     }
 
+    /**
+     * Checks if the id is that of one of the rail types
+     *
+     * @param id
+     * @return
+     */
+    public static boolean isRailBlock(int id) {
+       return id == 27 // Powered rail
+               || id == 28 // Detector rail
+               || id == 66; // Normal rail
+    }
+
     /**
      * Get the block or item that would have been dropped. If nothing is
      * dropped, 0 will be returned. If the block should not be destroyed