Insert commas at randomly selected words. This function modifies values
inside <code>words</code> array
@param {Array} words
function insertCommas(words) {
		var len = words.length;
		var totalCommas = 0;
		
		if (len > 3 && len <= 6) {
			totalCommas = randint(0, 1);
		} else if (len > 6 && len <= 12) {
			totalCommas = randint(0, 2);
		} else {
			totalCommas = randint(1, 4);
		}

		_.each(_.range(totalCommas), function(ix) {
			if (ix < words.length - 1) {
				words[ix] += ',';
			}
		});
	}