Add standalone build for 3.4 series

Merges the 3.3/develop branch up to 3.4/develop and updates the travis and composer configs for 3.4.x - continues kohana/kohana#50
Drat, I must have put it in to filter the run when I was working on those tests within kohana/kohana. It's made it into 3.3 now as well :frowning: Probably best if I revert it separately and merge up again once this is in?