Patches

• Chore(cron-job): add Quantum deps and basic setup:ed98827
• Refactor(cron): clear cache in midinight & add expire option:8106067
• Chore(clean-up): wip tags in tests:062506e
• Chore: merge pull request#169 from coderplanets/cron-job:115e70d
• Refactor(mailer): add template & fix typo:49d3dd2
• Feat(mailer): notify admin user for new content:abeb9ff
• Chore(clean up): import conventions:988eed4
• Refactor(mailer): fix test error & mv send logic to later:3cc2483