Rename options instance variable in Variable and Tag.

lib/liquid/variable.rb

@@ -12,14 +12,14 @@ module Liquid
   class Variable
     FilterParser = /(?:\s+|#{QuotedFragment}|#{ArgumentSeparator})+/o
     attr_accessor :filters, :name, :line_number
-    attr_reader :options
-    alias_method :parse_context, :options
+    attr_reader :parse_context
+    alias_method :options, :parse_context
     include ParserSwitching
 
     def initialize(markup, parse_context)
       @markup  = markup
       @name    = nil
-      @options = parse_context
+      @parse_context = parse_context
       @line_number = parse_context.line_number
 
       parse_with_selected_parser(markup)