This will only manipulate the OS X-level process name, not the title shown
in e.g. ps.

Some platforms require SO_REUSEPORT to be set for the socket.

Plus some minor cosmetic corrections

- [lib/dns.js] dns.lookup takes a new optional argument "family" which
  should be the integer 4, 6, dns.AF_INET or dns.AF_INET6. Passing a
  non-false "family" argument makes c-ares explicitly look up addresses for
  the specified family.

- [test/simple/test-c-ares.js] test explicit address family lookups

Regression.

Tests for child_process.spawn() use new API

Test for deprecated child_process.spawn() API

This makes the console methods more "browser-like",
for example:

  console.log("foo", "bar", "baz");
  // foo bar baz

but still works with formatting

  console.log("hey %s", "tj", "whats up");

  // hey tj whats up

If the first parameter passed into console.log() is not a string, all
parameters will be printed as formated by sys.inspect. This change
also affects console.info and console.warn.

This patch standardises the load order for modules. Highest priority is trying to load exactly the file the user specified, followed by native extensions, followed by registered extra extensions, etc.

In full, if we require('foo') having registered '.coffee' as an alternative extension, we try and load the following files in order:

    foo
    foo.js
    foo.node
    foo.coffee
    foo/index.js
    foo/index.node
    foo/index.coffee

This patch replaces the path.exists check for module loading with a call to
fs.statSync (or fs.stat for require.async) which ensures that it's not trying
to load a directory.