restore composer.json, add mysqli extension

public/vendor/dashboard/gulp-tasks/clean/css.js

@@ -0,0 +1,8 @@
+var clean = require('gulp-clean');
+
+module.exports = function(gulp, callback) {
+	return gulp.src(config.destination.css, {
+			read: false
+		})
+		.pipe(clean());
+};