Notify ontology admins of remote pull failures.

Fixes NCBO-505.
Merge branch 'ncbo-505' into staging. Resolve Gemfile.lock conflict.
Add email notification configuration.
Move email settings to LinkedData block.
NCBO-975 cron tests fixed (email and mapping counts)
Merge branch 'staging' of https://github.com/ncbo/ncbo_cron into staging
Jenkins: unit tests passed with bundle update, updating Gemfile.lock
Jenkins: unit tests passed with bundle update, updating Gemfile.lock
update lock file - rebuilding KB in staging
release - merge staging - lock updates