[MERGE] LRUCache changes

[John Arbash Meinel]

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This patch adds a few changes to LRUCache

1) Rename an initialization parameter for clarity.
2) Change the default so that "after_cleanup_count" is now 80% of the
max_cache value. The idea is that when we reach a full cache, clearing
out down to 80% is better than staying at 100% the whole time. As it
gives us some room to add more keys before we have to cleanup again. 80%
is pretty much chosen out of thin air, but I still believe it is better
than what we had.
3) Add LRUCache.resize(). This is mostly what I was after. I wanted to
have something that was a sane bound, but still allow me to grow it if
I'm finding that I'm thrashing the cache.

John
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