Suspended tickets

#### Changes
- Adds ```automation_controller``` which adds one endpoint: ```/suspended_tickets```
- Adds ```SuspendedTicketAutomation``` which queries the zendesk api and gathers numbers

Example usage of ```SuspendedTicketAutomation```:
```
suspended_ticket_automation = SuspendedTicketAutomation.new
suspended_ticket_automation.perform

suspended_ticket_automation.total
# => returns total count of suspended tickets

suspended_ticket_automation.causes
# returns hash with causes as keys and counts as values, ex:
# { "Automated response mail" => 2, "Detected email as being from a system user" => 1 }
```

@jacklar