Determine how to compile ICU data alongside ChakraCore

Minimal sub-task of #3755

See: http://userguide.icu-project.org/icudata#TOC-ICU-Data-Directory

The easiest thing for us to do is to ship icudt59l.dat (etc) with Node-ChakraCore and have ChakraCore dynamically calculate the directory on disk where it is stored from the directory that the executable lives in + a relative path from there to the data file.