xlsx-cli

This is a standalone version of the CLI tool for SheetJS.

For newer versions of node, the tool should be invoked with npx:

``bash
$ npx xlsx-cli --help # help and usage info
$ npx xlsx-cli --xlsx test.csv # generates test.csv.xlsx from test.csv
`

For older versions of node, the tool should be installed globally:

`bash
$ sudo npm install -g xlsx-cli # install globally (once)

$ xlsx-cli --help # help and usage info
$ npx xlsx-cli --xlsx test.csv # generates test.csv.xlsx from test.csv
``