Make client tracebacks more useful.

[fafhrd91]

replace following traceback with something more useful.

  File "/Users/nikolay/dev/files-api/venv/src/aiohttp/aiohttp/client.py", line 890, in read
    chunk = yield from self.content.read()
  File "/Users/nikolay/dev/files-api/venv/src/aiohttp/aiohttp/parsers.py", line 252, in read
    raise self._exception
  File "/Users/nikolay/dev/files-api/venv/src/aiohttp/aiohttp/parsers.py", line 155, in set_parser
    next(p)
  File "/Users/nikolay/dev/files-api/venv/src/aiohttp/aiohttp/protocol.py", line 302, in __call__
    out.feed_eof()
  File "/Users/nikolay/dev/files-api/venv/src/aiohttp/aiohttp/protocol.py", line 377, in feed_eof
    raise errors.IncompleteRead(b'')
nose.proxy.IncompleteRead: IncompleteRead: Bad Request

[fafhrd91]

ERROR [root] IncompleteRead(0 bytes read)
Traceback (most recent call last):
 File "/opt/files/src/libks/libks/web/application.py", line 66, in __call__
   resp = yield from resp
 File "/opt/files/src/fstorage/fstorage/client.py", line 17, in events
   message = yield from req.environ['wsgi.input'].read()
 File "/usr/local/lib/python3.4/dist-packages/aiohttp-0.7.2-py3.4.egg/aiohttp/parsers.py", line 334, in read
   yield from self._waiter
 File "/usr/lib/python3.4/asyncio/futures.py", line 348, in __iter__
   yield self  # This tells Task to wait for completion.
 File "/usr/lib/python3.4/asyncio/tasks.py", line 332, in _wakeup
   value = future.result()
 File "/usr/lib/python3.4/asyncio/futures.py", line 243, in result
   raise self._exception
 File "/usr/local/lib/python3.4/dist-packages/aiohttp-0.7.2-py3.4.egg/aiohttp/parsers.py", line 169, in feed_eof
   self._parser.throw(EofStream())
 File "/usr/local/lib/python3.4/dist-packages/aiohttp-0.7.2-py3.4.egg/aiohttp/protocol.py", line 292, in __call__
   yield from self.parse_length_payload(out, buf, length)
 File "/usr/local/lib/python3.4/dist-packages/aiohttp-0.7.2-py3.4.egg/aiohttp/protocol.py", line 345, in parse_length_payload
   raise errors.IncompleteRead(b'') from None
aiohttp.errors.IncompleteRead: IncompleteRead(0 bytes read)

[fafhrd91]

fixed in @5474bd8c583961b4ff1e553e0c4f0a1ca502f6ee

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