I HAVE FOUND THE ANSWER!!!!!
Please read the instructions CAREFULLY!!!!
1) Go to finder and do Shift+Command+G
2)Type ~/Library into the slot provided
3)Click on the folder named Application Support
4)Scroll down until you find a folder named Minecraft
5)In there you should find a jar file called launcher, click on that jar file.
The launcher should start up as normal allowing to also go on servers bypassing the update, use this technique until the Mojang team fix the problem.