Bundler

Remove the vendored sqlite3-ruby.
Instead, add support for Bundler
(which is vendored).

Before running the new Instiki,
do a 

   ruby bundle

which will install all of the needed gems
locally. (If you need to, tweak the contents
of Gemfile.)

config/preinitializer.rb

@@ -0,0 +1,23 @@
+begin
+  require "rubygems"
+  vend = File.join(File.dirname(__FILE__), '..', 'vendor')
+  Gem.use_paths File.join(vend, 'bundle', File.basename(Gem.dir)), (Gem.path + [File.join(vend, 'plugins', 'bundler')])
+  require "bundler"
+rescue LoadError
+  raise "Could not load the bundler gem. Install it with `gem install bundler`."
+end
+
+if Gem::Version.new(Bundler::VERSION) <= Gem::Version.new("0.9.24")
+  raise RuntimeError, "Your bundler version is too old for Rails 2.3." +
+   "Run `gem install bundler` to upgrade."
+end
+
+begin
+  # Set up load paths for all bundled gems
+  ENV["BUNDLE_GEMFILE"] = File.join(File.dirname(File.dirname(__FILE__)), 'Gemfile')
+  Bundler.setup
+rescue Bundler::GemNotFound
+  raise RuntimeError, "Bundler couldn't find some gems." +
+    "Did you run `bundle install`?"
+end
+