Website Tracker Slackbot (#797)
* added commands to reload script
* catch errors with git pull
* read new webhook from os variable
* correcting bash
* bash fixes
* formatting
* more robust error checking
* only sends success if git changes
* catching error from script
* escaping error text to send with curl
* correct text escaping for error message
Former-commit-id: c95f88075be45035ff44f2fe6371cddf28251f2a
