stream_wrap: fix long line introduced in da5ad92

Said commit was a back-port from a feature branch where it did lint.
Mea culpa.
smalloc: cleanup checks/conversions

* Moved the ToObject check out of smalloc::Alloc and into JS. Direct
  usage of that method is for internal use only and so can bypass the
  possible coercion.
* Same has been done with smalloc::SliceOnto.
* smalloc::CopyOnto will now throw if passed argument is not an object.
* Remove extra TargetFreeCallback function. There was a use for it when
  it was working with a Local<T>, but that code has been removed making
  the function superfluous.
smalloc: allow different external array types

smalloc.alloc now accepts an optional third argument which allows
specifying the type of array that should be allocated. All available
types are now located on smalloc.Types.
http: Use streams3 directly, not .ondata/end
stream: Short-circuit buffer pushes when flowing

When a stream is flowing, and not in the middle of a sync read, and
the read buffer currently has a length of 0, we can just emit a 'data'
event rather than push it onto the array, emit 'readable', and then
automatically call read().

As it happens, this is quite a frequent occurrence!  Making this change
brings the HTTP benchmarks back into a good place after the removal of
the .ondata/.onend socket kludge methods.
src: use v8::String::NewFrom*() functions

* Change calls to String::New() and String::NewSymbol() to their
  respective one-byte, two-byte and UTF-8 counterparts.

* Add a FIXED_ONE_BYTE_STRING macro that takes a string literal and
  turns it into a v8::Local<v8::String>.

* Add helper functions that make v8::String::NewFromOneByte() easier to
  work with. Said function expects a `const uint8_t*` but almost every
  call site deals with `const char*` or `const unsigned char*`. Helps
  us avoid doing reinterpret_casts all over the place.

* Code that handles file system paths keeps using UTF-8 for backwards
  compatibility reasons. At least now the use of UTF-8 is explicit.

* Remove v8::String::NewSymbol() entirely. Almost all call sites were
  effectively minor de-optimizations. If you create a string only once,
  there is no point in making it a symbol. If you are create the same
  string repeatedly, it should probably be cached in a persistent
  handle.
dgram: fix regression in string argument handling

v0.10 allows strings for the offset, length and port arguments to
dgram.send() and dgram.sendto() but master before this commit would
abort with the following assert:

    node: ../../src/udp_wrap.cc:227: static void
    node::UDPWrap::DoSend(const v8::FunctionCallbackInfo<v8::Value>&,
    int): Assertion `args[2]->IsUint32()' failed.

Go beyond what v0.10 does and also add range checks: offset and length
should be >= 0, port should be between 1 and 65535.

That particular change needs to be back-ported to v0.10 because passing
a negative offset or length number aborts with the following assertions:

    node: ../../src/udp_wrap.cc:264: static v8::Handle<v8::Value>
    node::UDPWrap::DoSend(const v8::Arguments&, int): Assertion
    `offset < Buffer::Length(buffer_obj)' failed.

Or:

    node: ../../src/udp_wrap.cc:265: static v8::Handle<v8::Value>
    node::UDPWrap::DoSend(const v8::Arguments&, int): Assertion
    `length <= Buffer::Length(buffer_obj) - offset' failed.

Interestingly enough, a negative port number is accepted in v0.10 but
is silently ignored.

This commit exposed a bug in the simple/test-dgram-close test which
has also been fixed.
dgram: don't call into js when send cb is omitted

Speed up dgram.Socket#send()-heavy code a little by omitting the call
into JS land when the user doesn't pass us a completion callback.
src: fix windows build breakage from f674b09

The TWO_BYTE_BUFFER macro never made it into the final version of
the patch that got landed in commit f674b09.
test: use common.PORT in simple/test-net-GH-5504
src: don't call v8::Object::SetHiddenValue()

Don't use v8::Object::SetHiddenValue() to keep a reference alive to the
buffer, we can just as easily do that from JS land and it's a lot faster
to boot.

Because the buffer is now a visible property of the write request
object, it's essential that we do *not* log it - we'd be effectively
serializing the whole buffer to a pretty-printed string.
node: remove domain nextTick

It's ridiculously cheap to check if process.domain is set. Don't bother
cluttering the code.
domain: share object and state with native land

Change process.domain to use a getter/setter and access that property
via an array index. These are much faster to get from c++, and it can be
passed to _setupDomainUse and stored as a Persistent<Array>.

InDomain() and GetDomain() as trivial ways to access the domain
information in the native layer. Important because we'll be able to
quickly access if a domain is active. Instead of just whether the domain
module has been loaded.
build: don't auto-destroy existing configuration

Don't run configure when the configure script has been touched. Doing so
would be okay if the Makefile passed the original arguments to configure
but it doesn't - it runs configure without any arguments, effectively
destroying the current configuration.

Remove this misfeature and instead print an error message telling the
user to (re-)run configure.
 build: make ninja build respect V=

 Compiling with `make V=1` (which is the default) now runs ninja in
 verbose mode. To disable, run `make V=`.
configure: order configure switches alphabetically

Alphabetical order should make it easier to find the switches you need
because we've got quite a lot of them now.

Keep --prefix at the top because that's arguably the one people will be
looking for most.
build: fix up style issues in configure script

* Use single quotes consistently.
* Remove a few stray semicolons.
* Fix up some overly long lines.
* Line up a few expressions.
build: disable SSLv2 by default

No one in this day and age should be using SSLv2 so disable it by
default. You can re-enable it with `./configure --with-sslv2` but
there really should be no reason for that.
v8: upgrade v8 to 3.20.14.1
v8: fix openbsd build

This is [1] applied ahead of time. Summary:

    OpenBSD doesn't have <ucontext.h>. ucontext_t lives in <signal.h>
    and is a typedef for struct sigcontext. There is no uc_mcontext.

[1] https://codereview.chromium.org/21705003/

Note: the patch has been accepted upstream but hasn't made its way into
a stable release yet.