cares_wrap: drop UV_HANDLE_FIELDS from ares_task_t

UV_HANDLE_FIELDS is a libuv implementation detail.  The ares_task_t
struct only uses the uv_loop_t* field so be explicit about that.
src: remove --max-stack-size option

Ad-hoc duplicate of V8's --stack-size option.  Superfluous in other
words.  Remove it.
src: call uv_loop_delete() on exit in debug mode

Should make tracing with valgrind a little easier on the eye and
possibly help expose libuv handle lifecycle issues.
src: remove two pointless globals from node.cc

De-globalize use_npn and use_sni, they're only used in GetFeatures().
lib: Add missing copyright notices
doc: Small update of readme for Windows users
fs: Expose birthtime on stat objects

Just do the best we can with whatever libuv gives us.

Also, document the semantics of `ctime` and the compatibility with
Windows.
domains: deprecate domain.dispose().

Follows @isaacs's recommendations in joyent/node#5018. Includes some
updates to documentation but not examples.

Conflicts:
	lib/domain.js