Add support for Jira integration that will post a comment with the pull request url on a jira story and link to the jira story in the pull request

Rollback Plan
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**If this pull request requires anything more complex (e.g., rolling back a migration), you MUST update this section. Otherwise, delete this note.**

To roll back this change, revert the merge with `git revert -m 1 MERGE_SHA` and perform another deploy.

URLs
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* [Jira issue IS-1404](https://sportngin.atlassian.net/browse/IS-1404)

QA Plan
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Did the jira integration work? :shipit: 

So I am a bit confused about the `self.comment = comment` part in `initialize` and this method.  Are they doing different things?