A cooperative version of waitpid that plays nicely with child watchers and gevent.subprocess

Don't ref the implicit child watchers unless explicitly asked for; they shouldn't keep the loop alive since the user didn't ask for them

A cooperative version of waitpid that plays nicely with child watchers and gevent.subprocess. Fixes #600. Ref #452.

Fix 607

This reverts commit 22141fc2.

setup.py deals gracefully with spaces in the working directory. Fixes #319. Also better handle newer compilers on OS X, which enforce the distinction between CFLAGS and CPPFLAGS.

Add more modules to the API reference; some of them need some documentation love. Fixes #379. [skip ci]

Make gevent.local.local eligible for GC as soon as the greenlet is dead, matching the native threading.local behaviour.

Also update the implementation to match Python 3.4. It appears to trade an extra weakref for better locality of reference.

Add kludge to make the default threadpool and threaded resolver work in forked children. The real issue seems to be that fork watchers aren't firing; there doesn't seem to be a test case for that. Fixes #230.

Occasional Travis failure under 3.4; cannot reproduce locally and the code is a duplicate of stdlib. [skip ci]

Account for different default bufsize under py3; avoid a resourcewarning under Py3 with GEVENT_FILE=thread; the incorrect bytes return in universal newlines should be fixed.