It was a good year for online gaming investors in 2013, with the companies making up the Gaming Intelligence stock index recording combined average share price growth of nearly 28 per cent during the year.Out of 52 publicly listed companies that make up the GI list, 37 saw their share value increase in 2013, with 34 achieving double-digit growth or better.Notable performers included US casino operator Caesars Entertainment, Italian operator SNAI and AIM-listed operator Webis [...]