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CHANGELOG:
Locks just one thread for all Dial calls instead of one per Dial.

This was leading to us closing fd that was in use by other routine and
thus causing problems in singlepoll code that should never have same fd
parked twice.

The cause was following:
If FileConn failed due to lack of free fd's for Dup operation we were
calling Close syscall to close the fd. This fd was previously passed to
os.NewFile which causes Golang to add finalizer for closing that fd.

If memory, file descriptor and connection pressure were right, Golang was
closing fd that was being parked on, which in turns meant that we could
get the same fd in the dial code, which would be parked again causing
the singlepoller to enter undefined state.

fix silly if error. Fixes #10

Add arm64 support to build constraints for use on iOS (darwin,arm64)

_compiles_ on windows

quick dirty fix for 32bit darwin

there's a rare case where dial returns successfully but for some
reason the RemoteAddr is not yet set. We wait here a while until
it is, and if too long passes, we fail. This is horrendous. This
shouldn't take more than a second. See also:
 * https://gist.github.com/jbenet/5c191d698fe9ec58c49d
 * http://cr.yp.to/docs/connect.html