Add FIFO ets_buffer
Add unit tests for ets_buffer
Swap 'ring' for 'circular' in documentation
Add tests for missing buffer_names
Add fifo single-threaded edge case tests
Simplify matchspec when ignoring record fields
Add lifo single-threaded edge case tests
Don't delete ring reads; num_items =< ring_size
Test edge cases of ring buffers
Merge remote-tracking branch 'jaynel/master' into release_0_9_2