Add list of SIMBAD objects and their celestial coordinates
Add LoadCoordinatesTest class
Add LoadCoordinatesTest.get_seps() class method
Add LoadCoordinatesTest.get_coords_data() class method
Add LoadCoordinatesTest.test_load_coordinates()
Add LoadCoordinatesTest.test_load_coordinates_empty_lines()
Add LoadCoordinatesTest.test_load_coordinates_empty_file()
Add LoadCoordinatesTest.test_load_coordinates_invalid_data()
Use regular expressions to parse the coordinates file
Add unit test for methods.load_coordinates()

This merges branch 'add-load_coordinates-unittest'