riding_binplot: Canadian federal ridings tile plot function
In mapcan: Tools for Plotting Canadian Choropleth Maps and Choropleth Alternatives

A function that returns a data frame with map data, for use in ggplot.

riding_binplot(riding_data, riding_col = riding_code, value_col,
  continuous = TRUE, arrange = FALSE, riding_border_col = "white",
  year = 2015, riding_border_size = 1, provincial = FALSE,
  shape = "square", province, legend_name = "default")

`riding_data`	A dataframe with a continuous or categorical riding-level characteristic and a riding code variable.
`riding_col`	An unquoted character expression specifying the riding code variable from the dataframe provided in `riding_data`.
`value_col`	An unquoted character expression specifying the column or categorical riding level characteristic you would like to visualize.
`continuous`	logical. Specify as `FALSE` if the variable is categorical (e.g. for winning party) and `TRUE` if the variable is continuous.
`arrange`	logical. Specify as `TRUE` if variable should be ranked according to value within provinces and `FALSE` to plot values according to riding coordinates. Because the binned ridings are only a rough approximation of their actual location, `arrange = TRUE` is often preferable.
`riding_border_col`	To ensure the appearance of stand alone tiles, set 'riding_border_col' to be the same as the background colour of the plot. Default is `"white"`.
`year`	Election year. Options are `1997`, `2000`, `2004`, `2006`, `2008`, `2011` and `2015`. This will change the number of tiles to correspond to the number of ridings in the election of the specified year. Default is `2015`
`riding_border_size`	Change the size of tiles. Larger values make smaller tiles. Default is `1`.
`provincial`	logical. Specify as FALSE for provincial (not federal) ridings of a single province. If `provincial = TRUE`, specify a 2-letter provincial abbreviation for the province in the `province` argument. Default is `FALSE` (i.e. the default is to provide federal electoral boundaries). (Note: this argument is still in development, only Quebec provincial boundaries are available at the moment.)
`shape`	Unquoted character expression specifying shape of tiles. Options are square and hexagon, default is square.
`province`	An unquoted character expression specifying the 2-letter provincial abbreviation of the province for which provincial electoral boundaries are desired. (Note: this argument is still in development, only Quebec provincial boundaries are available at the moment.)
`legend_name`	Quoted chacter expression specifying the title of the legend. The variable name will be used as a default if no value is supplied.

election_2015 <- federal_election_results[federal_election_results$election_year == 2015, ]

riding_binplot(riding_data = election_2015, riding_col = riding_code,
value_col = party, continuous = FALSE, arrange = TRUE)