`jsipfs version` should work without any ipfs repo

[chriscool]

I am adding sharness tests to jsipfs and it fails very early because jsipfs expects an ipfs repo:

$ IPFS_PATH='stuff' jsipfs version
error   no ipfs repo found
$ IPFS_PATH='stuff' ipfs version
ipfs version 0.4.2

Also it looks like jsipfs error messages are printed on stdout instead of stderr.

[chriscool]

cc @diasdavid