wrv 1.1.0

Add suggested package leaflet, allows the creation of interactive maps using the 'Leaflet' JavaScript library and the htmlwidgets package.
Update MODFLOW-USG version from 1.2 to 1.3, see release notes for details.
Change NEWS file to markdown format.
Remove RCurl from suggested packages.
Recreate package datasets using Appendix C code, no significant changes were identified.
Pass datasets as arguments in the UpdateWaterBudget and RunWaterBudget functions; these datasets were previously called from within the function.
Add code block identifiers in vignettes.

wrv 1.0.3

Remove DownloadFile function and edit Appendix C to reflect this change.
Add Makefile for automating package-development tasks.
Change to in-source documentation using roxygen2 package.
Change file name from sir2016_5080_usgsdatarelease.xml to sir2016-5080_usgsdatarelease.xml, a Water Node request.