plot files added, but devtools::document not run yet
Major changes:
(1) Added code and documentation for the plotting functions. Used a template documentation file for all plotting functions, except the two helper functions.
(2) In doing so, needed to re-document the package so many files were updated, although not really any different.

Minor changes:
(1) Deleted the figures folder since that was causing an error for me.
(2) Added a small change to the get_results_all function which adds an "ID" column to both datasets.
(3) I cleaned up the ts_dat.rda and scalar_dat.rda files, since they had extra cases in there and didn't include the ID column which is used by the plot function examples.
Merge branch 'add-plot-functions'
Re-document after merging in Cole's plotting code