I've been seeing a lot of people using the door bugging mechanic or the now - no longer working stump tactic to force the boss in his second form. This is probably the only way for melee classes to pull off a successful kill however as a shadowpriest (and I imagine hunters, warlocks and possibly mages can pull this off as well) there is an easy way to ''kite'' the bosses repeatedly allowing for easy casting and ''clever use of terain'' as there is really nothing involved that breaks rules since you really are just using what blizzard gave you. That's why I decided to refrain from posting it in the exploits section.
As you can see in the following video you can pull the boss and jump on a ledge against the wall where you will alternate between a vase and the wall in order to cause the boss(es) to run back and forth. after some time you'll eventually catch up on damage enough that the healer add will not keep up and you can finish them off followed by simply killing the second phase boss which is no more then a tank-and-spank.
Should you ever fall off the wall or vase you can easily jump back on the ledge without the boss somehow also getting on it or deciding to melee you there which causes for a pretty easy way to kill the boss.
I did look specifically for the words ''Tiger'' ''Tiger boss'' ''solo ZG'' and ''Zul'gurub'' and didn't get much further then finding people using the door mechanic or the tree stump one which by my knowledge is fixed. This method should prove easier for a select few classes and a whole lot more reliable.