make saveAsBinarySeries create directory and error if already exists
add conf.json output to saveAsBinarySeries
parameterize test saveAsBinarySeries across grouping dimensions
parameterize test saveAsBinarySeries across data types
load conf.json in SeriesLoader fromBinary
clean up series loader parameter handling
fix context loadImages to reflect new parameter order
finish fixing context loadImages to reflect new parameter order - oops
fix default parameter handling for binary loader