Add Spring and spring-aware binstubs

Also remove /script, which is no longer used in Rails 4

bin/cucumber

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+begin
+  load File.expand_path("../spring", __FILE__)
+rescue LoadError
+end
+require 'bundler/setup'
+load Gem.bin_path('cucumber', 'cucumber')

bin/rails

@@ -0,0 +1,10 @@
+#!/usr/bin/env ruby
+begin
+  load File.expand_path("../spring", __FILE__)
+rescue LoadError
+end
+# This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
+
+APP_PATH = File.expand_path('../../config/application',  __FILE__)
+require File.expand_path('../../config/boot',  __FILE__)
+require 'rails/commands'

bin/rake

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+begin
+  load File.expand_path("../spring", __FILE__)
+rescue LoadError
+end
+require 'bundler/setup'
+load Gem.bin_path('rake', 'rake')

bin/spring

@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+
+# This file loads spring without using Bundler, in order to be fast
+# It gets overwritten when you run the `spring binstub` command
+
+unless defined?(Spring)
+  require "rubygems"
+  require "bundler"
+
+  if match = Bundler.default_lockfile.read.match(/^GEM$.*?^    spring \((.*?)\)$.*?^$/m)
+    ENV["GEM_PATH"] = ([Bundler.bundle_path.to_s] + Gem.path).join(File::PATH_SEPARATOR)
+    ENV["GEM_HOME"] = ""
+    Gem.paths = ENV
+
+    gem "spring", match[1]
+    require "spring/binstub"
+  end
+end