Revert "Merge pull request #30 from alphagov/removing_need_to_specify_requester_email"

This reverts commit 043e678afc3a33f4e48922523c1669a935ecd30d, reversing
changes made to 2b3e2049e277e4e426c91ab991eff93affc40b1a.

Since redis isn't yet production-ready, we're backing this change out
Merge pull request #40 from alphagov/revert_redis_integration

Revert "Merge pull request #30 from removing_need_to_specify_requester_email