Merge pull request #278 from PFZheng/fix_known_applied_index

Add a new configuration |raft_fsm_caller_commit_batch|, which controls the batch size for FSMCaller to increase |known_applied_index|.

Use LOG(INFO) instead of LOG(NOTICE) to fix compile error with glog (#…

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Merge pull request #188 from PFZheng/master

Pick patchs from the internal stable branch of braft in Baidu.

Merge pull request #168 from tangwz/fix_typo

Fix typo

Merge pull request #130 from brpc/master

 Replace gflags namespace from google:: to FLAGS_NS:: to fix compatibility problem.

Merge pull request #128 from sduzh/master

Fix code style