Avoid storing options instance variable in BlockBody.

There is no need to pass parse options to the BlockBody initializer, since
it does all the parsing in the parse method, unlike tags which parse the
tag markup in the initializer.

lib/liquid/block.rb

@@ -6,7 +6,7 @@ module Liquid
     end
 
     def parse(tokens)
-      @body = BlockBody.new(options)
+      @body = BlockBody.new
       while more = parse_body(@body, tokens)
       end
     end
@@ -60,7 +60,7 @@ module Liquid
     protected
 
     def parse_body(body, tokens)
-      body.parse(tokens) do |end_tag_name, end_tag_params|
+      body.parse(tokens, options) do |end_tag_name, end_tag_params|
         @blank &&= body.blank?
 
         return false if end_tag_name == block_delimiter