tls: fix sporadic hang and partial reads

Do not decrement size in read loop, its used later, when comparing to
`bytesRead`.

fix #6270

NOTE: Original patch contributed by @roadrunner2
src: turn uv_pipe_open() failures into exceptions

uv_pipe_open() is unlikely to fail but when it does, the failure should
not be quietly ignored.  Raise the error as an exception.

See joyent/libuv#941.
2013.09.30, Version 0.10.20 (Stable)

* tls: fix sporadic hang and partial reads (Fedor Indutny)
  - fixes "npm ERR! cb() never called!"
Merge branch 'v0.10.20-release' into v0.10
Now working on 0.10.21
blog: Post for v0.10.20
doc: link to pre-built binaries, add install note

lLnk to http://nodejs.org/download/ and add a short primer on how to
extract the tarballs.

Fixes #6292.
doc: add warning to fs.exists() documentation

Warn against the open-if-exists anti-pattern, it's susceptible to
race conditions.
fs: fix fs.truncate() file content zeroing bug

fs.truncate() and its synchronous sibling are implemented in terms of
open() + ftruncate().  Unfortunately, it opened the target file with
mode 'w' a.k.a. 'write-only and create or truncate at open'.

The subsequent call to ftruncate() then moved the end-of-file pointer
from zero to the requested offset with the net result of a file that's
neatly truncated at the right offset and filled with zero bytes only.

This bug was introduced in commit 168a5557 but in fairness, before that
commit fs.truncate() worked like fs.ftruncate() so it seems we've never
had a working fs.truncate() until now.

Fixes #6233.
dtrace: backport two byte string fix

This is a partial backport of 5921158

Re #6309
Closes #6319
tls: fix premature connection termination

Destroying the TLS session implies destroying the underlying socket but
before this commit, that was done with net.Socket#destroy() rather than
net.Socket#destroySoon().  The former closes the connection right away,
even when there is still data to write.  In other words, sometimes the
final TLS record got truncated.

Fixes #6107.
blog: Remove wp-to-markdown script
doc: addon: fix object instantiation examples

* Extend examples to show how to handle non-constructor invocation in
  constructor callback functions.

* Fix up examples to initialize member variables at object construction.

* Fix up a few naming inconsistencies.

Fixes #5701.
doc: net: remove bad net.Server description

net.Server is not an instance of net.Socket so don't say it is.
test: use proper findjsobjects output format

Closes #6329
util: format as Error if instanceof Error
crypto: add SPKAC support

Implements new class 'Certificate' within crypto object for working
with SPKAC's (signed public key & challenge) natively.
doc: document os.loadavg() behavior on windows

The load average is a very UNIX-y concept.  That's why os.loadavg()
always returns zeros on Windows.  Mention that in the documentation.
doc: expand os.loadavg() section

Add a short explanation of what the load average is and why it's
unavailable on Windows.

Also sneak in a fix for a typo that I introduced in commit 56c5806.
doc: crypto: document SPKAC additions

Document the SPKAC functionality that was added in commit 7f66e44.