Log Message:
Update lang/nodejs4 to 4.5.0.

Semver Minor:

buffer:
- backport new buffer constructor APIs to v4.x
- backport --zero-fill-buffers cli option

build:
- add Intel Vtune profiling support

repl:
- copying tabs shouldn't trigger completion

src:
- add node::FreeEnvironment public API

test:
- run v8 tests from node tree

V8:
- Add post mortem data to improve object inspection and function's
  context variables inspection

Semver Patch:

buffer:
- ignore negative allocation lengths

crypto:
- update root certificates

libuv:
- upgrade libuv to 1.9.1
- upgrade libuv to 1.9.0

npm:
- upgrade to 2.15.9