create CoordinateConverterInterface, issue #78
use CoordinateConverter in Coordinates class, issue #78
add setter for CoordinateConverter, issue #78
add constructor taking CoordinateConverter as a parameter, issue #78
public modifier for a method is unnecessary in an interface.
add JavaDoc for method
rename method, should be camelCase
parameter should be final
add tests for setCoordinateConverter
define test coordinates in setUp
define test converted coordinates in setUp
create coordinateConverter mock in setUp
move asserting of converted Coordinates to a seperate method
move asserting of unconverted Coordinates to a separate method
add test for Constructor taking CoordinateConverter as parameter
wrap long lines.