added the --rm flag to the sample run command
removed document-level viewBox and set pattern preserveAspectRatio
fixed up the example usages at the top of the Dockerfile
added an example width param on the PNG converter
added descriptions for the main program arguments
always display full usage, even if a command is parsed, as I can't figure out any other way to get the main options to show
added a --print option that will do add bleeds and rotate, though rotation currently screws up the filters/patterns for some unknown reason.  So going to see about rotating the PDFs instead of the SVGs, since that's the only thing that actually needs to be rotated.
set up what I believe will do rotation of the PDFs after converting from SVG, but the network is too slow to actually get pdftk installed and test it