Private Slack channels

Feature - New Runbook step: Auto-add Services Related To Functionality. Feature - When linking services to VictorOps and GitHub, their respective routing keys appear with the external link name. Feature - For clarity, new incident Slack modals contain a Description field instead of a Summary field. The description field does not have a character limit. Feature - Private Slack Channels are available and can be added by using Runbook steps Bug - Added the option to turn off paging of the default VictorOps escalation policy if there are no impacted services in an incident. Bug - When selecting Jira projects in slack, we improved the dropdown to show your default project as well as other projects you can select and not show blank. Bug - Enforced limiting the ability to add changes to the 'new note' and 'edit incident' actions; changes can only be added to only active incidents in the Slack UI. (This prevents users from adding details or notes to inactive incidents.) Bug - Fixed bug that was creating duplicate incidents in Slack.