Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/composer/attributes/default.rb

@@ -1,29 +0,0 @@
-#
-# Cookbook Name:: composer
-# Attributes:: default
-#
-# Copyright (c) 2016, David Joos
-#
-
-include_attribute 'php'
-
-if node['platform'] == 'windows'
-  default['composer']['url'] = 'https://getcomposer.org/Composer-Setup.exe'
-  default['composer']['install_dir'] = 'C:\\ProgramData\\ComposerSetup'
-  default['composer']['bin'] = "#{node['composer']['install_dir']}\\composer.bat"
-  default['composer']['global_install']['install_dir'] = 'C:\\Program\ Files\\Composer'
-  default['composer']['global_install']['bin_dir'] = 'C:\\ProgramData\\Composer'
-else
-  default['composer']['url'] = 'http://getcomposer.org/composer.phar'
-  default['composer']['install_dir'] = '/usr/local/bin'
-  default['composer']['bin'] = "#{node['composer']['install_dir']}/composer"
-  default['composer']['install_globally'] = true
-  default['composer']['mask'] = '0755'
-  default['composer']['link_type'] = :symbolic
-  default['composer']['global_install']['install_dir'] = '/usr/local/composer'
-  default['composer']['global_install']['bin_dir'] = '/usr/local/bin'
-end
-
-default['composer']['global_configs'] = {}
-default['composer']['home_dir'] = nil
-default['composer']['php_recipe'] = 'php::default'