* V8: update to 3.28.71.19

* uv: upgrade to 1.5.0

* npm: upgrade to 2.9.1

* V8: don't busy loop in v8 cpu profiler thread (Mike Tunnicliffe)

* V8: fix issue with let bindings in for loops (adamk)

* debugger: don't spawn child process in remote mode (Jackson Tian)

* net: do not set V4MAPPED on FreeBSD (Julien Gilli)

* repl: make 'Unexpected token' errors recoverable (Julien Gilli)

* src: backport ignore ENOTCONN on shutdown race (Ben Noordhuis)

* src: fix backport of SIGINT crash fix on FreeBSD (Julien Gilli)