Make production env

We are nearing the type when we will need a "production" environment, so I thought I'd start that effort.

Summary:
- The `settings` table always had test = TRUE, regardless of the qiita_config value
- the TEST_ENVIRONMENT qiita_config parameter didn't seem useful, so I removed it (although @squirrelo and/or @josenavas might be able to correct me on that one)
- added ability to load ontologies regardless of which environment is being created with make_environment
- added the "production" environment, which is linked to the `qiita` database