resolver_ares: destroy() should be run in the loop, since it calls the outstanding callbacks directly

documentation is taken from http://haproxy.1wt.eu/download/1.5/doc/configuration.txt

- gevent.socket module adds 3 new methods: gethostbyname_ex, gethostbyaddr, getnameinfo (in addition to getaddrinfo and gethostbyname)
- added new bindings: core.ares_channel class
- Hub gets a new property: 'resolver'
- Added a new gevent.resolver_ares.Resolver class which translates from low-lever c-ares bindings into Python socket compatible functions