function clean(path, done) {
        log('Cleaning: ' + $.util.colors.blue(path));
        del(path, done);
    }
/*.spec.js'
        ];
        return gulp.src(files)
            .pipe($.karma({
                configFile: './tests/karma.conf.js',
                action: 'run'
            }))
            .on('error', function (err) {
                throw err;
            });
    });

    gulp.task('typescript-tests', ['clean-typescript-tests'], function () {
        var options = {
            target: 'ES5',
        };
        return gulp.src(['./tests/*