Update provision

remove .sh from add_mailbox

utils/provision

@@ -111,7 +111,7 @@ function application () {
     export MAIL_PASS=`tr -dc A-Za-z0-9_ < /dev/urandom | head -c 20 | xargs`
     export MAIL_USER="noreply.${arg_u}@${MAIL_DOMAIN}"
     export URL=${arg_u}
-    /indiehosters/utils/add_mailbox.sh ${MAIL_USER} ${MAIL_PASS}
+    /indiehosters/utils/add_mailbox ${MAIL_USER} ${MAIL_PASS}
     ./scripts/install
   fi
 }