Fix spelling of FilterSeparator constant.

lib/liquid.rb

@@ -22,7 +22,7 @@
 $LOAD_PATH.unshift(File.dirname(__FILE__))
 
 module Liquid
-  FilterSperator              = /\|/
+  FilterSeparator             = /\|/
   ArgumentSeparator           = ','
   FilterArgumentSeparator     = ':'
   VariableAttributeSeparator  = '.'

lib/liquid/variable.rb

@@ -19,8 +19,8 @@ module Liquid
       @filters = []
       if match = markup.match(/\s*(#{QuotedFragment})/)
         @name = match[1]
-        if markup.match(/#{FilterSperator}\s*(.*)/)
-          filters = Regexp.last_match(1).split(/#{FilterSperator}/)
+        if markup.match(/#{FilterSeparator}\s*(.*)/)
+          filters = Regexp.last_match(1).split(/#{FilterSeparator}/)
 
           filters.each do |f|
             if matches = f.match(/\s*(\w+)/)