Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).

- Added new EV_CLOSED event - detects premature connection close
by clients without the necessity of reading all the pending
data. Doe

Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).

- Added new EV_CLOSED event - detects premature connection close
by clients without the necessity of reading all the pending
data. Does not depend on EV_READ and/or EV_WRITE.

- Added new EV_FEATURE_EARLY_CLOSED feature for epoll.
Must be supported for listening to EV_CLOSED event.

- Added new regression test: test-closed.c

- All regression tests passed (test/regress and test/test.sh)

- strace output of test-closed using EV_CLOSED:
socketpair(PF_LOCAL, SOCK_STREAM, 0, [6, 7]) = 0
sendto(6, "test string\0", 12, 0, NULL, 0) = 12
shutdown(6, SHUT_WR) = 0
epoll_ctl(3, EPOLL_CTL_ADD, 7, {EPOLLRDHUP, {u32=7, u64=7}}) = 0
epoll_wait(3, {{EPOLLRDHUP, {u32=7, u64=7}}}, 32, 3000) = 1
epoll_ctl(3, EPOLL_CTL_MOD, 7, {EPOLLRDHUP, {u32=7, u64=7}}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...})
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYM...
write(1, "closed_cb: detected connection close "..., 45) = 45

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Use python2 rather than python

python may refer to either python2 or python3 so rather by explicit by
using python2.
See PEP 394 - http://www.python.org/dev/peps/pep-0394/ for more
details.

Replace big chain of if/thens in epoll.c with a table lookup

This should save a bunch of branches by doing instead a lookup in a
nice static table.

To ensure correctness, the table is generated fro

Replace big chain of if/thens in epoll.c with a table lookup

This should save a bunch of branches by doing instead a lookup in a
nice static table.

To ensure correctness, the table is generated from a Python script,
included with this commit.

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