Extract Parser#number parse out of Expression.parse

lib/liquid/parser.rb

@@ -52,11 +52,18 @@ module Liquid
       case token[0]
       when :string
         string
+      when :number
+        number
       else
         parse_expression(expression_string)
       end
     end
 
+    def number
+      num = consume(:number)
+      Expression.parse_number(num)
+    end
+
     def string
       consume(:string)[1..-2]
     end