Add missing var

This is breaking our convention, but until I have tests that fail for 
this file, I don’t want to make any modifications to adjust these 
variable declarations.
Fix misspelling
Use replay correctly / stop hiding errors
Fail the test when it’s not working

The previous implementation was not passing errors through express, 
which prevented the tests from failing.
MIL-512 Fix broken form mailer

We’re having some issues with Replay and Mandrill requests. They do not 
seem to be recorded…
Merge branch 'MIL-512-form-mailer'

* MIL-512-form-mailer:
  MIL-512 Fix broken form mailer
  Fail the test when it’s not working
  Use replay correctly / stop hiding errors
  Fix misspelling
  Add missing var