Fix lyrics formatting

[tgambet]

You could improve the following formatting logic :

alltomp3/index.js

Lines 75 to 80 in 7129f17

	html = _.trim(html.text());
	html = html.replace(/\r\n\n/g, '\n');
	html = html.replace(/\t/g, '');
	html = html.replace(/\n\r\n/g, '\n');
	html = html.replace(/ +/g, ' ');
	html = html.replace(/\n /g, '\n');

With :

html = html.text()
    .replace(/\r\n/g, '\n') // windows to linux new line style
    .replace(/\t/g, '') // no tabs
    .replace(/ +/g, ' ') // whitespaces
    .split('\n').map(line => line.trim()).join('\n') // trim every line
    .replace(/\n{3,}/g, '\n\n'); // no more than two new lines in a row

This would fix the formatting issues seen on lyrics.ovh.