Was Cobb dreaming at the end of Inception?

I just saw it again last night and I'm still wondering if he was in reality or still dreaming(possible stuck in limbo), although I believe that he was in reality. In my perspective it looked like the top was about to fall although that is very debatable. Also I've thinking and Cobb wasn't wearing his wedding ring at the end, and if he was in limbo he would have. I've tried to think about why people would believe Cobb was still dreaming but I just can't draw out a possible explanation unless all the events starting from the moment when Cobb woke up in the past were false. Otherwise there is just no reasonable explanation for me. The bottom line is that I just want some closure to this mystery, I know its all opinion but if I can get enough people to agree with me then I will be satisfied.