def ignore_gem(name, version, platform)
      ignored_gems[platform] ||= {}
      ignored_gems[platform][name] ||= []
      ignored_gems[platform][name] << version
    end
def ignore_gem(name, version, platform)
      ignored_gems[platform] ||= {}
      ignored_gems[platform][name] ||= []
      ignored_gems[platform][name] << version
    end
Adds a Gem to the list of Gems to ignore.

 @param [String] name
 @param [String] version