expand_urls now correctly matches urls pointing to the root directory, allowing / to be replaced with /subdir/ if site is configured with a different root directory

plugins/octopress_filters.rb

@@ -58,7 +58,7 @@ module OctopressFilters
   # Replaces relative urls with full urls
   def expand_urls(input, url='')
     url ||= '/'
-    input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\"'>]+)/ do
+    input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\"'>]*)/ do
       $1+url+$3
     end
   end