* Document changes in the configure command.
Document new add/remove replicas commands.
* updated quickstart with mongodb instructions
* Docs on how to setup mongodb dev node with and without docker.
Update replSet option in docker-compose
* Fixed typo.
More explicit on how to run the tests.
* Fixed typo in mongodb docker instructions.
More explicit about requiring mongodb 3.4+
* Added replicaset name to bigchaindb config
* changed travis replSet to match bigchaindb default
* Updated initialize_replica_set
It now initializes the replica set with the name provided by the
bigchaindb config file.
* initialize_replica_set is now called when creating a mongodb connection.
This way we are sure that a replica set exists when we return a
connection.
* Moved the initialize replica set logic to the connection.
* update the config documentation
