latest updates in kgio.git

[Eric Wong <normalperson@yhbt.net>]

Mostly documentation and test fixes without much effect on real code.

The biggest change is newly-connected sockets and opened files
(Kgio.tryopen) will have the close-on-exec descriptor flag set on it
when run under Ruby 2.0.0dev.  This is to remain consistent with the
behavior of core IO classes in Ruby 2.0.0dev.

accept()-ed sockets have always defaulted to close-on-exec in kgio,
regardless of Ruby version.

Summary of changes:

      connect: more descriptive error for TCP port
      use rb_update_max_fd() under MRI 1.9.3+
      TODO: update SSL/TLS support status :)
      LICENSE: s/GNU C Library/kgio/
      wait.c: fix misspelling in rdoc
      .wrongdoc.yml: add public/private email addresses
      test_poll: test for closing a polled IO in sighandler
      accept: always set O_NONBLOCK for accept()-ed sockets in 1.8
      accept: deprecate singleton Kgio.accept_* methods
      tests: remove tests for IO#nonblock? after accept
      connect,tryopen: set close-on-exec flag for new fds on Ruby 2.0+
      doc: update documentation regarding accept method flags

git://bogomips.org/kgio
master should be a40c1d4b30253c68d7997324bcebceb68018bc37

It's been a while since the last release, so I'm thinking about pushing
out 2.7.0 soon.  As always, feedback is greatly appreciated.