implement memcached CacheBroker
file headers
enable consistent hashing and optimizations + daemonize memcached IO thread
fix test case class name
fix invalid cache keys
fix config property name
make max cache object size configurable and disable client-side compressions
add memcached cache benchmarking code
properly propagate exceptions
emit cache timeouts metric
move dependency version to base pom
remove unused method
fix benchmarking code following removal of unnecessary method on MemcachedCacheBroker
Merge pull request #38 from metamx/memcached-cachebroker

memcached version of CacheBroker
defaults for rules to make startup a bit easier
[maven-release-plugin] prepare release druid-0.1.7
[maven-release-plugin] prepare for next development iteration
bug fix for using configurable default for datasource
[maven-release-plugin] prepare release druid-0.1.8
[maven-release-plugin] prepare for next development iteration