fix example
remove comment re: testing with pandoc 1.11

I did test with pandoc 1.11, and it doesn't compile, because pandoc
1.11 now hides Text.Pandoc.Highlighting.  I've sent a message to the
pandoc mailing list to ask why, and if there's a recommended upgrade
path.
fix Bool parsing to match configurator syntax
extra options should be specified with "xtras" field, not "xtra"
get rid of configurator package, it was just getting in the way
add password field parsing
add html-only flag
s/html/HTML/