Allow receive_incoming_mail to receive a String
Allow receive_incoming_mail to receive a String

You can now send a string rather than a filename to the
receive_incoming_mail spec helper.

For example:

    spam_email = <<-EOF
    From: EMAIL_FROM
    To: FOI Person <EMAIL_TO>
    Subject: Test Email

    Plz buy my spam
    EOF

    receive_incoming_mail(spam_email,
                          info_request.incoming_email,
                          'spammer@example.com')

4bic/alaveteli,4bic/alaveteli,andreicristianpetcu/alaveteli,andreicristianpetcu/alaveteli,andreicristianpetcu/alaveteli,andreicristianpetcu/alaveteli_old,4bic/alaveteli,nzherald/alaveteli,nzherald/alaveteli,andreicristianpetcu/alaveteli,4bic/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,nzherald/alaveteli,andreicristianpetcu/alaveteli_old,4bic/alaveteli,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,nzherald/alaveteli,Br3nda/alaveteli