use Ridley::CookbookResource.upload to upload cookbooks

remove Berkshelf::Uploader
refactor CachedCookbook to use Ridley::Chef::Cookbook as a base
remove and point to Ridley Cookbook management classes
bump required ridley and chozo versions
add explicit require for tmpdir to chef/config

required since we use this file for testing purposes
remove Chef::Digester; now located in Ridley
Merge pull request #388 from RiotGames/remove-uploader

remove uploader