Refactoring mmaster class to use a struct address instead a string and a int. Removing references to internal class structure.
Changing loop rate for print message
Adding a way to change node name avoid conflict on execution
Adding a master node method to search for a topic name.
Adding a master node method to read master information from environment variable
Adding implementation to method search used by search for a topic name
Adding implementation to a method that read ROS_MASTER_URI environment variable
Adding implementation to auxiliary methods to two methods above