Use end_with? instead of regexp for adding index.html

lib/jekyll/document.rb

@@ -163,7 +163,7 @@ module Jekyll
     def destination(base_directory)
       dest = site.in_dest_dir(base_directory)
       path = site.in_dest_dir(dest, URL.unescape_path(url))
-      path = File.join(path, "index.html") if url =~ /\/$/
+      path = File.join(path, "index.html") if url.end_with?("/")
       path
     end
 

lib/jekyll/page.rb

@@ -141,7 +141,7 @@ module Jekyll
     # Returns the destination file path String.
     def destination(dest)
       path = site.in_dest_dir(dest, URL.unescape_path(url))
-      path = File.join(path, "index.html") if url =~ /\/$/
+      path = File.join(path, "index.html") if url.end_with?("/")
       path
     end
 

lib/jekyll/post.rb

@@ -279,7 +279,7 @@ module Jekyll
     def destination(dest)
       # The url needs to be unescaped in order to preserve the correct filename
       path = site.in_dest_dir(dest, URL.unescape_path(url))
-      path = File.join(path, "index.html") if self.url =~ /\/$/
+      path = File.join(path, "index.html") if self.url.end_with?("/")
       path
     end