A cron job to fix parameter values' discrepancy.

Part of #136.
Merge remote-tracking branch 'upstream/master' into solvers_num
Reacting to code review (part of #136.)
Merge remote-tracking branch 'upstream/master' into solvers_num
Merge pull request #172 from egor83/solvers_num

Fixes #136 - number of solvers for a challenge is calculated incorrectly