http: remove bodyHead from 'upgrade' events

Streams2 makes this unnecessary.
An empty buffer is provided for compatibility.
uv: upgrade to 0.10.8
npm: Upgrade to 1.2.23
tls: retry writing after hello parse error

When writing bad data to EncryptedStream it'll first get to the
ClientHello parser, and, only after it will refuse it, to the OpenSSL.
But ClientHello parser has limited buffer and therefore write could
return `bytes_written` < `incoming_bytes`, which is not the case when
working with OpenSSL.

After such errors ClientHello parser disables itself and will
pass-through all data to the OpenSSL. So just trying to write data one
more time will throw the rest into OpenSSL and let it handle it.
doc: Minor fixup in http doc re bodyHead
2013.05.24, Version 0.10.8 (Stable)

* v8: update to 3.14.5.9

* uv: upgrade to 0.10.8

* npm: Upgrade to 1.2.23

* http: remove bodyHead from 'upgrade' events (Nathan Zadoks)

* http: Return true on empty writes, not false (isaacs)

* http: save roundtrips, convert buffers to strings (Ben Noordhuis)

* configure: respect the --dest-os flag consistently (Nathan Rajlich)

* buffer: throw when writing beyond buffer (Trevor Norris)

* crypto: Clear error after DiffieHellman key errors (isaacs)

* string_bytes: strip padding from base64 strings (Trevor Norris)
Merge branch 'v0.10.8-release' into v0.10
Now working on 0.10.9
blog: Post for v0.10.8
Merge remote-tracking branch 'ry/v0.10'

Conflicts:
	AUTHORS
	ChangeLog
	configure
	deps/uv/ChangeLog
	deps/uv/src/unix/darwin.c
	deps/uv/src/unix/stream.c
	deps/uv/src/version.c
	deps/v8/src/isolate.cc
	deps/v8/src/version.cc
	lib/http.js
	src/node_version.h
test: refactor line parsing into stream transform