Remove Bundler patch

The patch does not seem necessary any longer.

Gemfile

@@ -40,61 +40,3 @@ group :test do
   gem 'sinatra-contrib'
 end
 
-require 'bundler/installer'
-
-module ::Bundler
-  class Installer < Environment
-    MAX_RETRIES = 3
-
-    def install_gem_from_spec(spec, standalone = false)
-      retries = 1
-      # Download the gem to get the spec, because some specs that are returned
-      # by rubygems.org are broken and wrong.
-      Bundler::Fetcher.fetch(spec) if spec.source.is_a?(Bundler::Source::Rubygems)
-
-      # Fetch the build settings, if there are any
-      settings = Bundler.settings["build.#{spec.name}"]
-      Bundler.rubygems.with_build_args [settings] do
-        spec.source.install(spec)
-        Bundler.ui.debug "from #{spec.loaded_from} "
-      end
-
-      # newline comes after installing, some gems say "with native extensions"
-      Bundler.ui.info ""
-      if Bundler.settings[:bin] && standalone
-        generate_standalone_bundler_executable_stubs(spec)
-      elsif Bundler.settings[:bin]
-        generate_bundler_executable_stubs(spec, :force => true)
-      end
-
-      FileUtils.rm_rf(Bundler.tmp)
-    rescue Gem::RemoteFetcher::FetchError => e
-      if retries <= MAX_RETRIES
-        Bundler.ui.warn "#{e.class}: #{e.message}"
-        Bundler.ui.warn "Installing #{spec.name} (#{spec.version}) failed."
-        Bundler.ui.warn "Retrying (#{retries}/#{MAX_RETRIES})"
-        retries += 1
-        sleep retries
-        retry
-      else
-        Bundler.ui.warn "Installing #{spec.name} (#{spec.version}) failed after #{retries} retries: #{e.message}."
-        Bundler.ui.warn "Giving up"
-        msg = "An error, most likely because of network issues, has occurred trying to install #{spec.name} (#{spec.version}), "
-        msg << "and Bundler cannot continue."
-        raise Bundler::InstallError, msg
-      end
-    rescue Exception => e
-      # install hook failed
-      raise e if e.is_a?(Bundler::InstallHookError) || e.is_a?(Bundler::SecurityError)
-
-      # other failure, likely a native extension build failure
-      Bundler.ui.info ""
-      Bundler.ui.warn "#{e.class}: #{e.message}"
-      msg = "An error occurred while installing #{spec.name} (#{spec.version}),"
-      msg << " and Bundler cannot continue.\nMake sure that `gem install"
-      msg << " #{spec.name} -v '#{spec.version}'` succeeds before bundling."
-      Bundler.ui.debug e.backtrace.join("\n")
-      raise Bundler::InstallError, msg
-    end
-  end
-end