ETT will need to use the "depends on" links from jira issues.
Will need to make migration file to add this field to model
Will need to make helper methods in JiraBug to parse these from JIRA json: they come inside
"issuelinks", which is made up of "inward" and "outward issues. See sample jsons for details.
ETT will need to use the "depends on" links from jira issues.