<video> and x-sendfile

Using <object> and <embed> were forbidden for obvious
security reasons. Instiki now permits embedding video
via the HTML5 <video> element (Ogg/Theora encoded videos
only, with .ogg or .ogv extensions). You can even upload
videos with

    [[foo.ogg:video]]

Instiki now support x-sendfile. See the Proxying page for
configuring Apache (with the x-sendfile module). Lighttpd
should work similarly.

Update Rails to latest Edge (hopefully converging on RC2!).

vendor/rails/railties/lib/rails/gem_dependency.rb

@@ -72,13 +72,14 @@ module Rails
     rescue Gem::LoadError
     end
 
-    def dependencies
-      return [] if framework_gem?
-      return [] if specification.nil?
+    def dependencies(options = {})
+      return [] if framework_gem? || specification.nil?
+
       all_dependencies = specification.dependencies.map do |dependency|
         GemDependency.new(dependency.name, :requirement => dependency.version_requirements)
       end
-      all_dependencies += all_dependencies.map(&:dependencies).flatten
+
+      all_dependencies += all_dependencies.map { |d| d.dependencies(options) }.flatten if options[:flatten]
       all_dependencies.uniq
     end
 
@@ -149,6 +150,8 @@ module Rails
     end
 
     def unpack_to(directory)
+      return if specification.nil? || File.directory?(gem_dir(directory)) || framework_gem?
+
       FileUtils.mkdir_p directory
       Dir.chdir directory do
         Gem::GemRunner.new.run(unpack_command)