[patch] add extra http headers to request

[Mauricio Teixeira]

Hey guys,

I'm coding a plugin (will send for review after polishing) and because
of it I had the need to add a way to send extra http headers to the file
download request.

The patch attached can be used in the following way:

fetcher.setHttpHeaders({'header1': 'value1'], 'header2': 'value2'})

Sorry if I can't provide a test set right now, but as it has been coded
to satisfy my plugin needs, I don't know of any other use. :(

If any of you could review and tell me what you think, I would be glad.

I promise to send the mentioned plugin in a few days. :)

-- 
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