Merge pull request #51 from ldecicco-USGS/master

Fixed multi-pcode WQP call bug.
Merge pull request #52 from ldecicco-USGS/master

Final updates for 2.0.1
Merge pull request #53 from ldecicco-USGS/master

Help file updates.
Merge branch 'master' of github.com:USGS-R/dataRetrieval