Created basic SatNav and Junction classes
Basic test of data strucutre creation and added __repr__ methods
Added route length calculation and test case 1-5 with user input
 Added test case 6 and function to determine the number of correct routes less than a given number of nodes
Added test case 7 and function to determine the number of correct routes a certain number of junctions away
Added test cases 8 and 9. Implemented shortest route between two junctions calculated
Corrected shortest_route infinite failsafe test. Included test case 10. Implemented number of routes less than a given path distance