Revert "Removed a piece of code from attachments for an older version of mongo."

This reverts commit 6ff1b0eb84bfc4ee7e067b820473d3560fc94732.
Revert "Remove the tests for the old validation."

This reverts commit 5a3f3c5c1043641cc8874b0aa7669037ac0844d3.
Merge branch 'master' into add_old_mongo_code

* master:
  Remove broken FactoryGirl.lint
Added a comment so this doesn't get deleted later on.
Merge pull request #142 from biola/add_old_mongo_code

Revert "Removed a piece of code from attachments for an older version of...