Fix endless recursion and make sure we stay in site.dest

On Windows parent_dir can be 'd:/' causing an endless recursion.

Signed-off-by: Sven Strickroth <[email protected]>

Author: csware

lib/jekyll-multisite.rb

@@ -46,7 +46,7 @@ def sanitized_path(base_directory, questionable_path)
   class Cleaner
     def parent_dirs(file)
       parent_dir = File.dirname(file)
-      if parent_dir == '/'
+      if parent_dir == '/' or File.dirname(parent_dir) == parent_dir or !parent_dir.start_with?(site.dest)
         []
       elsif parent_dir == site.dest
         []