expand_truth: Creates a range of bins to score
In jarad/FluSight: Utility functions for the CDC FluSight competition

Expands the observed truth across a range of bins

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expand_truth(truth, week_expand = 1, percent_expand = 5, week53 = F,
  challenge = "ilinet", expand_by_percent = F,
  percent_observed = 0.1)

`truth`	A data.frame including columns unit and bin_start_incl
`week_expand`	A scalar numeric (default 1) indicating the number of bins to include around the observed value for week targets.
`percent_expand`	A scalar numeric (default 5) indicating the number of bins to include around the observed value for percent or rate targets. If `expand_by_percent = TRUE` then this value is ignored.
`week53`	A logical value (default 'FALSE') indicating whether to include MMWR week 53 in the expanded truth.
`challenge`	one of "ilinet", "hospital" or "state_ili", indicating which challenge the submission is for (default `"ilinet"`).
`expand_by_percent`	A logical value (default 'FALSE') indicating whether to expand truth around percent or ratetargets by a percentage of the observed value.
`percent_observed`	A scalar numeric between 0 and 1 (default 0.1), indicating the one-sided percentage of the observed percent or rate target that will be included. If `expand_by_percent = FALSE` then this value is ignored.