Make seeds.rb closer to idempotent
Make seeds.rb closer to idempotent

While not completely idempotent, this allows a failing seeds file to
be run again
bmarkons/ruby-bench-web,klgilbert/ruby-bench-web,klgilbert/ruby-bench-web,klgilbert/ruby-bench-web,bmarkons/ruby-bench-web,ruby-bench/ruby-bench-web,treble37/ruby-bench-web,ruby-bench/ruby-bench-web,treble37/ruby-bench-web,bmarkons/ruby-bench-web,treble37/ruby-bench-web,ruby-bench/ruby-bench-web