• Added support for loading several datasets via multiple -i commands.
• Default target of a command is the output of the previous command (previously the default target was all layers).
• Added -target command to set the default target.
• target= option and -target command accept numerical layer ids; first layer of first dataset is 1.
• Added -quiet command to inhibit console messages.
• -info command shows information about all layers in all datasets.
• Updated applyCommands() to accept an object containing contents of multiple input files and return an object containing contents of multiple output files (via callback).
• Added -uniq verbose option, to show which features are removed.
• Added -o extension= option, to set the file extension of exported GeoJSON and TopoJSON files.