[directory-upload] Consider changing the boolean param of getFiles to a dictionary (#34)

d.getFiles({recursive: true}) would be, IMO a bit more clear than d.getFiles(true), and by using dictionary we could extend the functionality easily later, if wanted. For example in the future we could add { filter: "*.html,*.htm" } there or some such.


@bakulf, @jwatt, @aliams 

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