Add semantic versioning tagging



Deploy Plan
-----------
Does Infrastructure need to know anything special about this deploy? If so, keep this section and fill it in. **Otherwise, delete it.**

Rollback Plan
-------------
**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
----
* [Jira issue MOBILE-635](https://sportngin.atlassian.net/browse/MOBILE-635)

QA Plan
-------
Provide a detailed QA plan, or other developers will retain the right to mock you mercilessly.

So a few things here:

1.  `config` here should always respond to `semantic_versioning` because we have told it to do so.  If it doesn't, there is something wrong with octopolo and we probably want to know about it, so I would say remove that check.
2.  The `if config.semantic_versioning == true` could probably just be distilled down toe `if config.semantic_versioning` since anything that sets it is probably reasonable as a "truthy" value.