Resolve full, absolute paths to fix build issue

[EranSch]

gulp build was failing, providing the following error:

➜  ng6-starter-jspm git:(jspm) ✗ gulp build
[06:24:53] Using gulpfile ~/Repos/ng6-starter-jspm/Gulpfile.js
[06:24:53] Starting 'build'...
[06:24:53] 'build' errored after 317 ms
[06:24:53] Error on fetch for client/app/app.js at file:///Users/eschoellhorn/Repos/ng6-starter-jspm/client/client/app/app.js
    Error: ENOENT: no such file or directory, open '/Users/eschoellhorn/Repos/ng6-starter-jspm/client/client/app/app.js'
    at Error (native)

It seems that JSPM was preprending the root path (perhaps from its config?) to the app's entry point. Adding path.resolve to the gulpfile's resolveTo function results in absolute paths being returned. This resolved the problem I was having.

[PatrickJS]

thanks!