Fix repl and other misc code, including test - #211

At some point Node.js repl.rli was deprecated. Properties of 'rli'
were already present in 'repl' REPLServer object, so this is a simple
change.

Node.js 'assert' module complains if we try to use assert.throws to
check an exception that is literally Error('error') has a message
'error', saying that it's ambiguous.

We were calling fs.unlink without providing callback, so this test was
failing to clean up its temporary file.