added artists, comments

test/factories/artist.rb

@@ -0,0 +1,7 @@
+Factory.define(:artist) do |f|
+  f.name {Faker::Name.first_name}
+  f.creator {|x| x.association(:user)}
+  f.updater_id {|x| x.creator_id}
+  f.updater_ip_addr "127.0.0.1"
+  f.is_active true
+end