Update lang/nodejs4 to 4.4.7.

Notable Changes

- debugger:
  * All properties of an array (aside from length) can now be printed
    in the repl
- npm:
  * Upgrade npm to 2.15.8
- stream:
  * Fix for a bug that became more prevalent with the stream changes
    that landed in v4.4.5.
- V8:
  * Fix for a bug in crankshaft that was causing crashes on arm64
  * Add missing classes to postmortem info such as JSMap and JSSet

(fhajny)