Don't attempt to subclass the internal socket._fileobject class, because using that takes special platform knowledge. Instead, proxy around it. This lets us drop a call to gc.collect() under PyPy because the refcounting is now correct. It also lets us clean up the implementation.

Update the docs.

Also documentation updates for the server modules.

Documentation for pool and semaphore. Add return types for some Cython semaphore functions in hopes of better code.

Use the return value of the function, don't shortcut through the current thread. sometimes under py3 the current thread id isn't set, and the release() methods we're trying to patch around use get_ident() anyway. Fixes #615. Really, not just the test cases.

Cleanup logging locks that were created before monkey patching thread. Also, fix monkey patching of threading.RLock under Python 3.

Provide better, pro-active error messages if a non-callable is asked to be spawned as a greenlet. Fixes #119.

Add a monkey-patch for __import__ that properly locks multiple greenlets. Apply it automatically under python 2 (not needed on Py3). Fixes #108.

Implement FileObjectPosix on top of `io` in Python 2.