Tests use test/helper instead of doing everything manually

test/database.yml

 test:
   adapter: sqlite3
-  #dbfile: paperclip.db
   database: ":memory:"
 

test/geometry_test.rb

-require 'rubygems'
-require 'test/unit'
-require 'shoulda'
-
-require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'geometry.rb')
+require 'test/helper'
 
 class GeometryTest < Test::Unit::TestCase
   context "Paperclip::Geometry" do

test/integration_test.rb

-require 'test/helper.rb'
+require 'test/helper'
 
 class IntegrationTest < Test::Unit::TestCase
   context "Many models at once" do

test/iostream_test.rb

-require 'rubygems'
-require 'test/unit'
-require 'stringio'
-require 'tempfile'
-require 'shoulda'
-
-require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'iostream.rb')
+require 'test/helper'
 
 class IOStreamTest < Test::Unit::TestCase
   context "IOStream" do

test/paperclip_test.rb

-require 'test/helper.rb'
+require 'test/helper'
 
 class PaperclipTest < Test::Unit::TestCase
   context "Calling Paperclip.run" do

test/storage_test.rb

-require 'rubygems'
-require 'test/unit'
-require 'shoulda'
-require 'right_aws'
-
-require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'geometry.rb')
+require 'test/helper'
 
 class StorageTest < Test::Unit::TestCase
   context "Parsing S3 credentials" do

test/thumbnail_test.rb

-require 'rubygems'
-require 'test/unit'
-require 'shoulda'
-require 'mocha'
-require 'tempfile'
-
-require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'geometry.rb')
-require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'thumbnail.rb')
+require 'test/helper'
 
 class ThumbnailTest < Test::Unit::TestCase