Merge pull request #11 from twitter/develop

Merge from twitter/storehaus
MySQL batch puts
override default multiput
add BatchedStore for writes
fix semaphore bug
sequence the inster, update, delete queries
Merge pull request #175 from rubanm/batch_writable_store

 add BatchedStore for writes
future fixes
cleaner putResult
Merge pull request #173 from rubanm/mysql_batch

MySQL batched multiPut
Merge branch 'develop' into storehaus-instrument
Long increments
clearer name for TimeUnit values
another unit name
documentation, hoist abstract insrumentation members to the top of its definition to make it easier to see what implementations need to implement