bubble up the errback

install notes for the command too

indentation hax

context-aware leading indentation

fix for inline function expressions

show variables in the usage

bump for function arg to prompt()

document readline, delim

function test passes

failing test for fn arg to prompt()

scrap 0.4

outfile arg for the command and write prompts to stderr

using travis

simple test passes

fix to put back default values, but cb fires multiple times