Removed cookbooks chef-gems and common for code refactoring
1) Create a new LWRP cookbook called bin_tray that handles bin_tray downloads.
2) The LWRP cookbook also provides a shasum validator.
3) The Packer cookbook is now re-organized to use bin_tray cookbook.
1) Added an installation package for ruby gem bundler.
2) Added an installation package for ruby librarian-chef.