[MERGE] FIFOCache and FIFOSizeCache

[Robert Collins]

bb:tweak

fifo_cache and lru_cache module docstrings should reference each other I
think.


+        if key in self:
+            # Remove the earlier reference to this key, adding it again
bumps
+            # it to the end of the queue
+            del self[key]
+        self._queue.append(key)

might be better as:
try:
    # Remove the earlier reference to this key, adding it again bumps
    # it to the end of the queue
    del self[key]
except KeyError:
    pass
self._queue.append(key)

with the if key in self optimisation pushed down to __delitem__

-Rob

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