Merge pull request #4 from schristel-USGS/master

Update Vignette Work
Merge pull request #5 from schristel-USGS/master

Continued to work on the dataframe portion of the vignette
Continuing to work on vignette. Still working on Section 2 which outlines the dataframes in HydroOpt
Just continuing to work on Section 2 of the USGSHydroOpt vignette...still work to do on section 2
Merge pull request #2 from USGS-R/master

Vignette Section 2 Pull