more policy and auth work

Rakefile

@@ -53,8 +53,6 @@ end
 namespace :db_sampler do
   task export: :environment do
     url_names = ENV["url_names"] || raise("need 'url_names' (comma-separated)")
-    # outfile_path = ENV["outfile"] || raise("need 'outfile' (file path)")
-    # outfile = File.open(outfile_path, "wb")
     outfile = $stdout
     DbSampler.new(outfile).export(url_names.split(","))
   ensure
@@ -62,8 +60,6 @@ namespace :db_sampler do
   end
 
   task import: [:environment] do
-    # infile_path = ENV["infile"] || raise("need 'infile' (file path)")
-    # infile = File.open(infile_path, "rb")
     infile = $stdin
     DbSampler.new(infile).import
   ensure