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