Refactor files handling.

[fafhrd91]

Right now it is not possible to use file object as data parameter for client request

[fafhrd91]

@asvetlov @popravich @kxepal does anyone use files uploading?

[kxepal]

I have to, but not yet started implementation of required bits. As far as I can see 359f6e8 changes, this refactoring removes one required feature for me: handling both data and multiple files to organize multipart/mixed request, when both data and multiple files are specified and each has own Content-Type. I was hope to reuse data and files arguments to implement required wrapper. I'll make prototype to check my worries about later today and'll provide feedback then if you don't mind.

[fafhrd91]

with new code you can mix parameters and files, something like that:

aiohttp.request(
  'post', 'http://....',
  data = [
      ('field1', 'value'),
      ('field2', 'value2', 'plain/text'),
      ('field3', open(filename,'rt'), 'text/html', 'filename')]
)

[kxepal]

Sweet!

[asvetlov]

@fafhrd91 I and @popravich didn't use file uploading yet.

[fafhrd91]

@kxepal you also can construct aiohttp.FormData object and pass it as request data

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