If mount fails, let's "modprobe" the partition type and try again

It would appear that mount fails to "modprobe btrfs" for whatever reason.  This is a reasonably clean workaround for that problem (modprobe $PARTITION_TYPE).
Merge pull request #254 from SvenDowideit/add-maintainers

create an initial MAINTAINERs file
Merge pull request #242 from tianon/mount-sucks

If mount fails, let's "modprobe" the partition type and try again
make the data partition autocreation clearer