Issue #222: Fix the @coroutine decorator for functions without __name__
attribute like functools.partial().

Enhance also the representation of a CoroWrapper if the coroutine
function is a functools.partial().

Read process exit status to avoid the "Caught subprocess termination from
unknown pid" message.

Really kill the child process, don't mock completly the Popen.kill() method.

This change fix memory leaks and reference leaks.

Patch written by Serhiy Storchaka <storchaka@gmail.com>.

finished

* _check_resolved_address() is implemented with getaddrinfo() which is slow
* If available, use socket.inet_pton() instead of socket.getaddrinfo(), because
  it is much faster

Microbenchmark (timeit) on Fedora 21 (Python 3.4, Linux 3.17, glibc 2.20) to
validate the IPV4 address "127.0.0.1" or the IPv6 address "::1":

* getaddrinfo() 10.4 usec per loop
* inet_pton(): 0.285 usec per loop

On glibc older than 2.14, getaddrinfo() always requests the list of all local
IP addresses to the kernel (using a NETLINK socket). getaddrinfo() has other
known issues, it's better to avoid it when it is possible.

transport was closed. The check broken a Tulip example and this limitation is
arbitrary. Check if _proc is None should be enough.

Enhance also close(): do nothing when called the second time.