Don't archive cards

commit d960ce9ad464b0cbc569961763983eb092033004
Author: Jeff McCune <jeff@puppetlabs.com>
Date:   Wed Mar 6 16:49:11 2013 -0800

    Only archive cards if ARCHIVE_CARD=true or yes

    This patch finishes the work wiring up delayed jobs to the original
    user-configured environment.  With this patch applied the
    TrelloPullRequestClosedJob class will only archive a card if the
    application environment was configured with ARCHIVE_CARD=true or
    ARCHIVE_CARD=yes at the time the job was originally created.

    The values are case insensitive.