Sending email from discrepancy checking cron job

(#245)
Merge remote-tracking branch 'upstream/master'
Reacting to code review (#245).
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Reacting to code review (#245).
Merge pull request #251 from egor83/master

Sending email from discrepancy checking cron job