Issues and Improvements regarding geojson

[KS-HTK]

Issues

• Simple plot currently only plots lines that have geodata. [bug] simple_plot() does not pot lines since geojson update #2275 (fix in fixed simple_plot not plotting lines that are missing geodata. #2280)
• create_line_collection/create_bus_collection ignores lines/buses indecies and plots everything. (fix in fixed simple_plot not plotting lines that are missing geodata. #2280)
• create_line creates invalid geojson objects. list of coords in nested to deep.

Improvements

• create_buses expects list as docstring says but previously could use other iterables. Should accept any iterable.