Patch by Marc Lehmann.
This fix should be included in the next libev release.

This reverts commit 25d0e380.

Re-enable test-https-large-response.js

Closes GH-614.

Also disable test-https-large-response.js. Covered by
test/simple/test-tls-throttle.js

Closes GH-613.

Closes GH-612.

Closes GH-604.

These are options needed for real-world multicasting.

Implementation notes:
- POSIX only.
- IPv4 only (IPv6 multicast is a tricky beast).
- Didn't update tests, because it can't effectively be demonstrated on
  localhost only.

See http://code.google.com/p/v8/issues/detail?id=884

See http://code.google.com/p/v8/issues/detail?id=884