gulpfile - no longer needs to change cwd

it was fixed upstream: https://github.com/tkellen/node-liftoff/issues/16

Just `npm install -g gulp` to update.

gulpfile.js

@@ -28,9 +28,6 @@ var reload = browserSync.reload;
 // public URL for your website
 var PUBLIC_URL = 'https://example.com';
 
-// enable use of relative paths even though gulp is run in sub-directories
-process.chdir(__dirname);
-
 gulp.task('styles', function () {
     return gulp.src('app/styles/sass/styles.scss')
         .pipe($.rubySass({style: 'expanded', precision: 10}))