This patch consists of the following changes:

* Splitting eventlet.greenio into base, py2 and py3 parts
  (eventlet.greenio should be exporing the same public objects). This
  change is motivated by the size and the number of conditions present
  in the current greenio code
* Connected to the first point: implementing almost completely new
  GreenPipe callable utilizing parts of old GreenPipe code but dropping
  _fileobject/SocketIO inheritance in favour of io.FileIO and making use
  of patched _pyio.open function which wraps raw file-like object in
  various readers and writers (they take care of the buffering,
  encoding/decoding etc.)
* Implementing (from scratch or updating existing versions)
  green versions of the following modules:

  * http.* (needed by Python 3's urllib)
  * selectors (Python >= 3.4, used in subprocess module)
  * urllib.* (needed by various tests and we were already exposing green
    urllib)

* Modifying some tests to make tests pass, which includes:

  * unicode/bytestring issues
  * modifying wsgi_test_conntimeout.py to not pass bufsize and close
    arguments to ExplodingSocketFile - on Python 3 it inherits from
    SocketIO, which doesn't deal with buffering at all as far as I can
    see

* Random cleaning up and reorganizing
* Requiring Python 3.x tests to pass for the whole build to pass

Known issues:

* code repetition
* naming inconsistencies
* possibly breaking some external code using private eventlet.greenio attributes

Closes https://github.com/eventlet/eventlet/issues/108

Affects https://github.com/eventlet/eventlet/issues/6 (I'd call it an
experimental support)

Should help for https://github.com/eventlet/eventlet/issues/145
Should help for https://github.com/eventlet/eventlet/issues/157

Some error paths concatenate the output of "type" with a string,
which gives TypeError: cannot concatenate 'str' and 'type' objects,
rather than describing the actual error.

Closes #149 GH
Closes #150 GH

Conflicts:
	eventlet/hubs/twistedr.py

Closes #161 (GH)

This includes:

* patching more tests to pass
* removing few unit tests which I think are redundant
* repeating SSL socket reads in a loop to read all data (I suspect this is
  related to the fact that writelines is used in the server code there and
  Python 3 writelines calls write/send repeatedly while on Python 2 it
  calls it once; on one hand there's no guarantee that single recv/read
  will return all data sent by the server, on the other hand it's quite
  suspicious that the number of required reads seems to be connected to
  the number of sends on the other side of the connection)
* working through Python 2/Python 3 threading and thread differences; the
  lock code I used is the simplest way I could make the tests pass but
  will likely need to be modified in order to match the original

This commit includes 6bcb1dc and closes GH #153

Closes #137
Closes #148

This includes changes to WSGI, websocket, bytes/str/unicode handling,
SSL, backdoor, greenio and tests.

Some comments and conditionals (PY2/PY3) were added for clarity

GH issues:

Closes #106
Closes #111
Closes #118
Closes #141

Incidentally should also close #135 (reopen if didn't)

cc #6

Closes GH-102
Closes GH-103
Closes GH-104

https://github.com/eventlet/eventlet/issues/101