High-performance lock-free queue in golang (multiple producers, multiple consumers)

Since I develop this package after reading through yireyun's code, The project look just like yireyun/go-queue and I also used some code from yireyun's project.

Difference with yireyun/go-queue:

• Queue interfaces are different.
• Put/Get does not run runtime.Gosched() if Queue is full/empty, but let the user decide what to do.
• Put/Get does not return false if CAS fail, but will retry after runtime.Gosched() until success.
• Make it faster for a little bit by eliminating false sharing.