Speedtest package

Hi all.

I created speedtest mini package for LEAF routers using mini_httpd (it 
was needed just to add upload size calculation cgi script); but placing 
it into main tree looks not a good idea (it's size is almost 100MB - 
test data). But it'll be enough useful for people.

Maybe we should create a some storage for such 3rd-party LRPs?

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