bumped date in description file
updated the readme
improved print method for occ_search to account for multi-value queries, etc, #95
removed old vignette files and remaking vignette to align with new code
added fields param to argscoll output for print method
added remove nulls to collection of args for print method
fixed wrong var name in print method for occ_search
updated vignette and moved new .rmds into vignettes dir