Set up dummy null data for  site 0545120 (South Fork Iowa Rive near New
Providenc, IA) to demonstrate the labels for the graphs with no data.
Used canvas to draw the No Data on the streamflow and water quality
graphs. For the benchmark graph, I created a function to return the text
to show. My thinking is that we can modify this in the feature to show
the number of collected samples if that information is available.
Merge branch 'master' of github.com:USGS-CIDA/nar_ui into NAWQAAN-304
Removing criteria line on sample plots

Removed criteria line on sample plots for all except NO23 plots
Now properly dealing with negative numbers 

If negative percentages are found, they are not included in with the pie
chart
Merge pull request #226 from isuftin/NAWQAAN-312

Now properly dealing with negative numbers
Fix legend handling for null
Merge pull request #227 from isuftin/NAWQAAN-307

Fix legend handling for null
Merge branch 'master' of github.com:USGS-CIDA/nar_ui into NAWQAAN-304
Removed commented out code.
Merge pull request #224 from mbucknell/NAWQAAN-304

Nawqaan 304
Refactored TimeSeries object

- No longer a global configuration for 1993
- Moved cut-off functionality into a self-contained function with an
incoming param switch (default to true) whether or not to cut off date
to lower bound (1993 currently)
Merge pull request #228 from isuftin/NAWQAAN-315

Refactored TimeSeries object
Merge pull request #225 from isuftin/NAWQAA-316

Removing criteria line on sample plots
Changed wording for N criteria line