File uploads

[Bluebie, Jenna]

NoMethodError undefined method `tempfile' for #

That sure is odd... I guess in Camping 2.0, uploads are not a  
Camping::H. Can we please change Camping::H to output ::H's instead of  
the original value when the original value is_a?(::H)

That be good. Recursive yumminess. Doesn't solve hashes in arrays, but  
is nice for this and some other things like playing with JSON. :)

Looks like to do that, we'd need to override Hash#fetch, and maybe  
Hash#[] and stuff... complex, maybe beyond camping scope. Still, I  
really think for consistency file upload hashes in the @input should  
be ::H's. Maybe not put the functionality in ::H, maybe some  
processing specific to @input.

Coming right down to it, I'm thinking about putting the functionality  
in the actual Hash class.... why don't we do that normally? does it  
cause problems with some libraries?
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