Hello,
Adds another arity where the "ns" parameter is set to a default value of **ns** in these fns:
ns-unmap, ns-resolve, ns-name, ns-map, ns-publics, ns-imports, ns-interns, ns-refers, ns-aliases, ns-unalias
I find I very often use ns-unalias and ns-unmap from the repl, and passing the **ns** arg gets a little tedious.
