Generalize envs() and args() to iterators.

 * Command::envs() now takes anything that is IntoIterator<Item=(K, V)>
   where both K and V are AsRef<OsStr>.
 * Since we're not 100% sure that's the right signature, envs() is
   now marked unstable.  (You can use envs() with HashMap<str, str> but
   not Vec<(str, str)>, for instance.)
 * Update the test to match.

 * By analogy, args() now takes any IntoIterator<Item=S>, S: AsRef<OsStr>.
   This should be uncontroversial.

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