update go-datastore to use []byte values instead of {}interface values

* Most of our datastores barf on non []byte values.
* We have to have a bunch of "is this a []byte" checks.
* Saves some allocations.

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

path.go

 package iface
 
 import (
-	ipfspath "gx/ipfs/QmTG5WFmAM4uAnqGskeAPijdpTmmNDLJNCQ71NqfdvC6hV/go-path"
+	ipfspath "gx/ipfs/QmV1W98rBAovVJGkeYHfqJ19JdT9dQbbWsCq9zPaMyrxYx/go-path"
 
 	cid "gx/ipfs/Qmdu2AYUV7yMoVBQPxXNfe7FJcdx16kYtsx6jAPKWQYF1y/go-cid"
 )