build: allow building with dtrace on osx
dtrace: pass more arguments to probes

OSX and other DTrace implementations don't support dereferencing
structs in probes. To accomodate that pass members from the struct as
arguments so that DTrace is useful on those systems.
dtrace: actually use the _handle.fd value

When using the DTrace/systemtap subsystems it would be helpful to
actually have an fd associated with the requests and responses.
dtrace: check if _handle property is set

Check that _handle is an object before trying to read its `fd`
property, avoids bogus values.
etw: update prototypes to match dtrace provider

The DTrace probes were updated to accomodate platforms that can't
handle structs, update the prototypes for ETW but it's not necessary
to do anything with the new arguments as it's redundant information.
assert: Simplify AssertError creation
child_process: acknowledge sent handles

Fix race-condition when multiple handles are sent and SCM_RIGHTS
messages are gets merged by OS by avoiding sending multiple handles at
once!

fix #4885
test: fork-getconnections stricter, less chatty
npm: Upgrade to 1.2.17
http: Remove legacy ECONNRESET workaround code

Fix #5179
2013.04.03, Version 0.10.3 (Stable)

* npm: Upgrade to 1.2.17

* child_process: acknowledge sent handles (Fedor Indutny)

* etw: update prototypes to match dtrace provider (Timothy J Fontaine)

* dtrace: pass more arguments to probes (Dave Pacheco)

* build: allow building with dtrace on osx (Dave Pacheco)

* http: Remove legacy ECONNRESET workaround code (isaacs)

* http: Ensure socket cleanup on client response end (isaacs)

* tls: Destroy socket when encrypted side closes (isaacs)

* repl: isSyntaxError() catches "strict mode" errors (Nathan Rajlich)

* crypto: Pass options to ctor calls (isaacs)

* src: tie process.versions.uv to uv_version_string() (Ben Noordhuis)
v8: cherry-pick 75311294 from upstream

Quote from commit message:

    Create a new HandleScope for each JSON-parsed object to avoid
    excessive growth.
Merge branch 'v0.10.3-release' into v0.10
Now working on 0.10.4
blog: Post about 0.10.3
crypto: use better memory BIO implementation