timers: internal unref timers should use Timer.now
http: use an unref'd timer to fix delay in exit

There was previously up to a second exit delay when exiting node
right after an http request/response, due to the utcDate() function
doing a setTimeout to update the cached date/time.

Fixing this should increase the performance of our http tests.
deps: upgrade c-ares to piscisaureus/cares@805d153

This should fix the Android build.
smalloc: zero size allocs may need to be free'd

Zero size allocations don't necessarily mean that data == NULL. So
instead check each value seperately and perform necessary operations.
smalloc: call callback if set on AllocDispose

Fix bug where if dev passed a callback to Alloc then called AllocDispose
it wouldn't bother to pass the data to the callback and instead would
just free it.
benchmark: update callbacks only receive data

Since the SlabAllocator was removed the buffer length/offset is no
longer sent to the onread callback. The benchmarks have been updated to
reflect that.
tls_wrap: return Error not throw for missing cert
buffer: propagate originating parent

When creating a slice, make sure to propagate the originating parent.
This is to prevent a buf.parent.parent.(etc) scenario.

Also speed up the constructor by preventing lookup of non-existant
properties by setting them beforehand in the prototype. (see
https://github.com/joyent/node/commit/7ce5a31#commitcomment-3332779)
configure: fix the --without-ssl option

Closes #5807.
crypto: throw a helpful error message for "tls" and "crypto"

When node is compiled with the --without-ssl flag.
http: style
http: Proper KeepAlive behavior

Instead of destroying sockets when there are no pending requests, put
them in a freeSockets list, and unref() them so that they do not keep
the event loop open.

Also, set the default max sockets to Infinity, to prevent the awful
surprising deadlocks that happen when more connections are made.
http: Add agent.get/request methods
http: Reuse more http/https Agent code
http: Use OOP for OutgoingMessage._finish

Sniffing instanceof a child class in the parent class's method
is Doing It Wrong.
smalloc: don't take address of stack var
src: cast strong persistent handles to locals

Avoids the overhead of creating a new Local every time we unwrap a
Persistent handle.
src: remove unnecessary calls to Local<T>::New()
http: Dump response when request is aborted

Fixes #5695
doc: fix bad markdown parsing in list