Converted vignette to Rmd
Remade docs with roxygen2
Package no longer contains data sample subset and extract_nid no longer references it.
Added a NEWS.md file to track changes to the package.
Data from NID was downloaded in March 2014.
NID’s website claims to have more than 80,000 dams; however, only 74,000 dams could be obtained from the website’s UI.
Package comes with sample data; entire dataset available on bitbucket.org/rationshop