fix the seeds

Seed names were not unique due to ignoring the digits in the
competition names, which are sometimes the only difference.

Signed-off-by: Zeljko <zeljko@zwr.fi>
rails g scaffold run and seeds

Note that run belongs to entry, and has a text reference
to the race, and that is it. App has to find that race by name.

Signed-off-by: Zeljko <zeljko@zwr.fi>