intercepted_emails was renamed to intercept_and_forward_emails_to

Name "intercepted_emails" implied that emails sent to those emails
will be intercepted and other emails will not.

New name "intercept_and_forward_emails_to" makes it clear that all
emails will be intercepted and will be forwarded to mentioned emails.
indentation and consistency
moved host to common in settings
email interception should not be specific to an environment
Merge pull request #16 from bigbinary/wordsmitthing

Email interception should not be specific to production env and name change