Bundle gdal data inside `./lib`?

[springmeyer]

The files inside of ./deps are not needed at runtime (only build time) except for the data files GDAL and Proj4 need.

What about moving those files (and seeing GDAL_DATA and PROJ_LIB) to a relative path inside ./lib? This would reduce the chance that a developer (like me) would unknowingly drop break node-gdal usage by deleting the the ./deps directory.

/cc @BergWerkGIS