Add path.join so that pkg could auto detect assets

[jingsam]

pkg could auto package assets if we use path.join(__dirname, 'aaa.txt')

[mapsam]

Thanks @jingsam - could you provide the error that pkg gives so I can try to recreate?

[jingsam]

This error is not display when you package it, but when you run your packaged app, it complaints:

Error: File '/**/foxgis-server-lite/node_modules/@mapbox/mbtiles/lib/schema.sql' was not included into executable at compilation stage. Please recompile adding it as asset or script.
    at error_ENOENT (pkg/prelude/bootstrap.js:422:17)
    at readFileFromSnapshot (pkg/prelude/bootstrap.js:646:29)
    at Object.fs.readFileSync (pkg/prelude/bootstrap.js:689:18)
    at Object.<anonymous> (/snapshot/foxgis-server-lite/node_modules/@mapbox/mbtiles/lib/mbtiles.js:28:21)
    at Module._compile (pkg/prelude/bootstrap.js:1243:22)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)

[jingsam]

ping @mapsam

[mapsam]

@jingsam can you rebase against master to get tests passing again? Looks like the utils folder was removed in #77

[jingsam]

ping @mapsam

[mapsam]

Thanks @jingsam - looks good!