detect "full-icu" module #3460

Followup to nodejs/node-v0.x-archive#8996

• The npm module full-icu will at postinstall time make sure node_modules/full-icu contains the appropriate icudt*.dat file needed for full ICU support.
  • it also prints out instructions on how to fire up Node with full ICU.
• Proposal: somehow detect the special (?) module name full-icu in any of the global search paths or local module search paths. If found && the correct icudt file is present, _automatically set Node's ICU path to point to that icudt_.dat file*

This will make getting full data as easy as npm install [-g] full-icu