Add tests

newRoverisinstanceOf, hasPosition, getPositionReturnsCurrentPosition, directMovesRover
Remove test testing whether rover isinstanceof
Add method to printPosition and change method to getPosition to return position information
Remove BeforeClass and AfterClass
Changes to plateau parsing call/methods

Reduce parsedInstructions to just instructions. Change name of method convertStringto include reference to int.
Change getters and setters to be public