Revert "use relative_require so specs work with root Rakefile. TODO: remove"

This reverts commit 58467eba69, which was
causing specs to break on Ruby 1.8.

test_app/spec/controllers/controller_spec.rb

@@ -1,4 +1,4 @@
-require_relative '../spec_helper.rb'
+require 'spec_helper'
 
 describe ArticlesController do
   fixtures :articles,:impressions,:posts,:widgets

test_app/spec/controllers/impressionist_uniqueness_spec.rb

@@ -1,4 +1,4 @@
-require_relative "../spec_helper.rb"
+require 'spec_helper'
 
 # we use the posts controller as it uses the impressionsist module. any such controller would do.
 describe DummyController do

test_app/spec/intializers/initializers_spec.rb

@@ -1,4 +1,4 @@
-require_relative '../spec_helper'
+require 'spec_helper'
 
 describe Impressionist do
   it "should be extended from ActiveRecord::Base" do

test_app/spec/models/counter_caching_spec.rb

@@ -1,4 +1,4 @@
-require_relative '../spec_helper'
+require 'spec_helper'
 
 describe Impression do
   fixtures :widgets

test_app/spec/models/model_spec.rb

@@ -1,4 +1,4 @@
-require_relative '../spec_helper'
+require 'spec_helper'
 
 describe Impression do
   fixtures :articles,:impressions,:posts

test_app/spec/rails_generators/rails_generators_spec.rb

@@ -1,4 +1,4 @@
-require_relative '../spec_helper'
+require 'spec_helper'
 require 'systemu'
 
 # FIXME this test might break the others if run before them

test_app/spec/spec_helper.rb

@@ -1,4 +1,3 @@
-# This file is copied to spec/ when you run 'rails generate rspec:install'
 ENV["RAILS_ENV"] ||= 'test'
 require 'simplecov'
 SimpleCov.start 'rails'