Merge pull request #2 from thejpster/use_hard_tabs

Use hard tabs.

Add more comments to README.

Replace SeqCst with Acquire/Release.

Seems to work OK on my PC.

Formatting.

More comments, and resolve contention in 'push' to make 'pop' simpler.

Use larger items in test.

Fix comment.

Increase test length and fix possible hazard.

Added a multi-threaded test case.

Removed full/empty.

Add some comments, and replace self.length with self.length()

Add some docs and licensing.

Now backed by a separate buffer.