Enhancement: support for upload

[Valid]

I've been trying for several days to figure out how to upload images to flickr and get a response with the new image id for a few days, and nothing seems to work quite right. I'd love to see support for this added to flickrnode, as you already support auth.

[ciaranj]

Hey dude, can you check out this fork: http://github.com/mrjjwright/flickrnode/commit/c80a5a088e1c07a5f9a103384525c6c6741998dd

If it works I'll pull it back in (I've been meaning to for ages, just not had time :( )
-cj
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