On /admin/games, highlight pending games with outstanding picks in red.

Note: this query has an N+1 problem but seems unavoidable.
Show impact of decided picks at /my/picks.

* Update picks_table partial to accept argument "show_result" (so we can still share a table between decided and pending).
* Use Bootstrap badges to indicate win/loss.
More scope/time problems solved with lambda
Fix seed data - home/away were flipped!
One-time migration to reverse home/away teams & scores. Fix seeds.rb generator.