Log Message:
Update lang/nodejs to 8.7.0.

deps:
- update npm to 5.4.2
- upgrade libuv to 1.15.0
- update V8 to 6.1.534.42

dgram:
- support for setting dgram socket buffer size

fs:
- add support O_DSYNC file open constant

util:
- deprecate obj.inspect for custom inspection

tools, build:
- there is a fancy new macOS installer