Fix broken 'raw' tag parsing (issue #204)

lib/liquid/tags/raw.rb

@@ -1,12 +1,14 @@
 module Liquid
   class Raw < Block
+    FullTokenPossiblyInvalid = /^(.*)#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}$/o
+
     def parse(tokens)
       @nodelist ||= []
       @nodelist.clear
-
       while token = tokens.shift
-        if token =~ FullToken
-          if block_delimiter == $1
+        if token =~ FullTokenPossiblyInvalid
+          @nodelist << $1 if $1 != ""
+          if block_delimiter == $2
             end_tag
             return
           end
@@ -18,4 +20,3 @@ module Liquid
 
   Template.register_tag('raw', Raw)
 end
-