They (arsenal) should've had a penalty and everton rode their luck towards the end.
True, but Arsenal should have converted their chances; if you are bombarding an opponent's goalmouth, - and you are placed second in the Premiership (and your team are paid stupid money, although Arsenal are by no means the worst offenders in their regard), you really need to convert your chances and opportunities into goals.
Anyway, while I am an Arsenal supporter, I must give all credit to Everton for an insanely successful defence in the dying minutes of the game.