beef up memcache
Merge branch 'develop' into feature/better_memcached

Conflicts:
	project/Build.scala
Merge branch 'develop' into feature/better_memcached

Conflicts:
	storehaus-memcache/src/main/scala/com/twitter/storehaus/memcache/MemcacheStore.scala
Merge branch 'develop' into feature/better_memcached
remove codec
Merge pull request #121 from twitter/feature/better_memcached

Augment MemcacheStore with common functions