I looked at wiki and it said source blocks (including water, lava, fire and portal) have been removed in 1.8 ;-;
if you create one and try to ruin an island youd be banned.. not to say that they wouldnt just.. not allow them to begin with, so it wouldnt even be a problem.. xD
Im glad that the only source block I had was fire, lava and water blocks turn into buckets which are really common because of new island chests :eh
Guys don't flip out about source blocks disappearing. Worst case scenario the server needs a plugin adding those blocks back. They aren't going to disappear.