- support stdin again - restart any known files at their previous positions as recorded by the registrar.
- support stdin again
- restart any known files at their previous positions as recorded by the
registrar.

scrapinghub/log-courier,linearregression/log-courier,scrapinghub/log-courier,srizzling/log-courier,dixitk13/log-courier,MichaelLiZhou/log-courier,MichaelLiZhou/log-courier,dixitk13/log-courier,dixitk13/log-courier,srizzling/log-courier,scrapinghub/log-courier,MichaelLiZhou/log-courier,srizzling/log-courier,linearregression/log-courier,linearregression/log-courier