Allow non-pretty har dump

[EliSnow]

WebPageTest's export.php which provides the har dump, contains a parameter of pretty which determines whether the json is indented. Using the webpagetest har <id> command does not expose this parameter and seems to always request the prettified json which often has a much larger file size.

I would like a parameter, or for it to be the default, to get the non-prettified har file.