```ruby
require File.expand_path(File.join(File.dirname(__FILE__), 'env'))
require 'active_model'
require 'active_support/core_ext/object'
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/deep_dup'
require 'active_support/core_ext/enumerable'
require 'active_support/core_ext/module/delegation'
require 'active_support/dependencies'
require 'active_support/inflector'
require 'ostruct'
require 'delegate'
require 'braintree'
require 'braintree/exceptions'

require 'braintree_rails/array_ext'
require 'braintree_rails/module_ext'
require 'braintree_rails/braintree_ext'
require 'braintree_rails/exceptions'
require 'braintree_rails/braintree_rails'
```

Make it Rails 4.0 compatible
user
```ruby
require File.expand_path(File.join(File.dirname(__FILE__), 'env'))
require 'active_model'
require 'active_support/core_ext'
require 'active_support/dependencies'
require 'active_support/inflector'
require 'ostruct'
require 'delegate'
require 'braintree'
require 'braintree/exceptions'

require 'braintree_rails/array_ext'
require 'braintree_rails/module_ext'
require 'braintree_rails/braintree_ext'
require 'braintree_rails/exceptions'
require 'braintree_rails/braintree_rails'
```
assistant