rough RV voting implementation

...g_calc/templates/rv_voting_calc/includes/option_list.html

...mplates/rv_voting_calc/steps/found_popularity_winner.html

...ing_calc/templates/rv_voting_calc/steps/initial_sort.html

rv_voting_calc/templates/rv_voting_calc/steps/no_winner.html

...g_calc/templates/rv_voting_calc/steps/removed_option.html

...ing_calc/templates/rv_voting_calc/steps/with_support.html

rv_voting_calc/views.py