fix issue #27: socket.getaddrinfo improperly handles the case where socktype or proto is 0. Patch by Randall Leeds.

add test for issue #27: getaddrinfo improperly handles case where socktype or proto is 0. Thanks to Randall Leeds.

It's no longer possible to read or write from more than one greenlet. An AssertionError would be raised in the second greenlet if you do. (It's still OK to recv in one greenlet and send in another).

socket: make wait_read/write/readwrite functions accept additional event argument. add cancel_wait() function

socket: add wait_read/wait_write/wait_readwrite to __all__: it's a useful API that should be public and stable

setup.py: remove code related to guessing libevent version; do not set USE_LIBEVENT_? macro, it's no longer used

-1 and -2 options are gone

- that way __del__ on local is not necessary

monkey: make patch_thread() use gevent.local.local; also make it explicitly set threading.local and _threading_local.local

coros: reimplement Semaphore similarly to how Event is implemented; add rawlink() and wait() methods

- add DummySemaphore class