Merge pull request #4 from ldecicco-USGS/master

added eval to match.call functions.
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #6 from ldecicco-USGS/master

Added appveyor.yml file.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.
Unifying argument names.