Durability Issue

[stefanpenner]

In the following circumstances:

• when expanding the database file during an add, and
• when an existing entry is wrapped around the end of the database file (since this is a ring buffer)

We erase the old wrapped tail, prior to updating the database header.
https://github.com/linkedin/cassette/blob/master/Cassette/CASQueueFile.m#L453

        [self ringEraseAtPosition:QueueFileHeaderLength length:count];

Although the window is small, if a crash occurs during this period it will result in corrupted data.

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This solution should be simple, removing the line in question is most likely all we need