ENH Fix list return in Python3+ to return bytes
ENH Fix list return in Python3+ to return bytes

This causes many problems in Python3+.

Closes #10

It also fixes a more serious bug whereby all of the keys in a jugdir
started with b'! This was because a conversation from bytes to str was
causing the prefix b' to be added to all keys!

luispedro/jug,luispedro/jug,unode/jug,unode/jug