Output number of files in gulp.

gulpCountFiles.js

function count(type) {
    var counter = 0;
    return through(function countFiles(data) {
        counter++;
        this.queue(data);
    }, function endStream() {
        console.log('           ' + counter + ' ' + type + ' files processed');
        this.queue(null);
    });
}

// example usage:  gulp.src(files).pipe(count('.js')).pipe(...)...