Merge pull request #10 from ldecicco-USGS/master

Added clipping function, and increased provided shapefiles to lower 48.
Merge pull request #2 from USGS-R/master

update changes
Merge pull request #11 from ldecicco-USGS/master

Added leap year correction.
Merge pull request #4 from USGS-R/master

update changes to computeSeasonal
Merge pull request #12 from ldecicco-USGS/master

Added summarize function, started optimizing MapColorSize function
Merge pull request #13 from ldecicco-USGS/master

Changed name to USGSHydroTools
Merge pull request #14 from schristel-USGS/master

update changes
Update README.md
Merge branch 'master' of github.com:USGS-R/USGSHydroTools
Changed name to USGSHydroTools.
Updated help files to reflect current function.