Add DbCommand isMaster
Add mongod actions script for testing purpose
Add Cygwin support on mongod_actions script
Add isMaster method in Db class
Rename Db connection to masterConnection and keep it private
Add ConnectionManager to handle connection socket and in/out queues
Connection is managed by ConnectionManager
Manage open with ConnectionManager
Database close must be asynchronous
Close procedure for ConnectionManager
Add replica set management and fix authentication
First test on replica set
Replace mongod_actions bash script by mongo_action Dart library
Merge pull request #45 from sestegra/master

Add support for replica set