Update documentation (#581)

Expand buffer functionality (#389)

Update documents (#384)

* WIP: Doc

* more docs

* Update documents

* More doc update

Fix to compiler error on Mac (#221)

[Refactor] Rename member variables (#174)

Add new callback event for new session from leader (#115)

* We should differentiate opening connection and receiving message
from valid leader, as leader can be changed without closing connection.

Fix a place where sm_commit_index_ is wrongly updated (#94)

Allow election timer on restart_election_timer API (#82)

* Election timer flag should be updated on election timer restart,
as the flag will not be effective anymore if timer is initiated.

Handle the case when logs do not exist (#37)

* If there is no snapshot, and logs are already compacted, leader
should protect itself rather than crashing.

* Update logger to fix recursive crash handler issue.