restore composer.json, add mysqli extension

public/vendor/dashboard/gulp-tasks/sass/themes.js

@@ -0,0 +1,7 @@
+var sass = require("gulp-sass");
+
+module.exports = function (gulp, callback) {
+  return gulp.src(config.source.sass + '/themes/**/*.scss')
+    .pipe(sass().on('error', sass.logError))
+    .pipe(gulp.dest(config.destination.css + '/themes/'));
+};