Formatting and remove unused imports
Move global function into RedisStorage scope

The function is unused elsewhere in the codebase. This commit is to cleanup a function that is ostensibly a private function call and remove it from the global scope where it is unused.
Set the entire alert_data as a property in an Alert object

Also added an accessor get method for said data
Added twilio notifier
Pass in alert to notifier_proxy, and consume it from all notifiers
Allow overriding the pagerduty service_key for a given alert
Add the ability to override the phone number on a per-alert basis