modify cacheBroker interface to implement bulk-get
don't let timeout skew benchmark stats
implement bulk get test
fix duplicate keys, shutdown gracefully and make sure we check all multiget keys in memcached benchmark
fix interrupted thread
replace Pair<String, ByteBuffer> with NamedKey
rework code pulling from cache to be more readable
rename cacheBroker -> cache
simplify MapCache
Merge pull request #58 from metamx/cache-bulkget

modify cacheBroker interface to implement bulk-get