Version 0.9

• GEXF format added #49
• Float weight support added #50
• tox.ini added
• Menu optimized #48
• pyrgg.py renamed to graph_gen.py
• Other functions moved to functions.py
• Test system modified
• params.py refactored
• graph_gen.py refactored #63
• functions.py refactored
• weight_str_to_number function renamed to convert_str_to_number
• branch_gen function bugs fixed #63
• input_filter function bug fixed #59
• gl_maker function bug fixed #67
• CONTRIBUTING.md updated
• AUTHORS.md updated
• print_test function removed
• left_justify function removed
• justify function removed
• zero_insert function removed