Required changes and extensions

- new class T1000 inheriting from RobotBluePrint
- additional case "T1000" in RobotFactory for creating T1000 instances
- test cases for T1000 class
- test cases for instance creation in RobotFactory
- implementation of think and speak method for T1000
- eventually implementation of sorting algorithm
- eventually override of other robot methods depending of the specification of the T1000