EvanOdell/hansard: v0.4.6

Added optional tidy_style parameter, allowing users to decide which style of "snake_case", "camelCase" and "period.case" they want variable names to be in, if tidy==TRUE.

The elections() function now accepts start_date and end_date parameters. As the API called by the elections() function only accepts one additional argument not included in the package (the label of the election), changed the extra_args parameter to label to query that argument.

The tidy parameter now changes date values to POSIXct class with as.POSIXct() when the API returns date information, or to POSIXct with the parse_date_time from the lubridate package where the API returns both date and time information.

tidy parameter now strips out more unneeded character strings from API response.

Updated elections() to work with new API syntax.