Fixes remaining custom_forms plugin broken tests

  fast_create(Person) used on tests leaves the user blank so the target
  for the email had no address causing deliver to throw an error, so I
  just replaced fast_create for create_user

  This patch just makes the tests pass. I haven't tested the plugin
  myself so I have no guarantee it works.
Merge branch 'custom-forms-tests' into 'master'

Fixing custom_forms broken tests

Now the tests for custom_form plugin pass on noosfero using rails3.

See merge request !370