Added call to retrieve hypoxic extent when the May load for the fake
site is requested. Modified LoadPlot.js to show the extent when data is
available.

Removed detailed and summary links from id popup when the fake site is
selected. 

Pass in to GraphPopup.create only the staname and id. Set these
correctly for the fake site.
Passing in a siteId = "GULF" for the virtual site. Also passing is
isVirtual so that the fake site ID is only hard coded in
mississippi/main.js.
Merge pull request #262 from mbucknell/NAWQAAN-367

Nawqaan 367
NAR download form hooked up.
Reordered some fields around to attempt to make it logical
Merge pull request #263 from thongsav-usgs/NAWQAAN-333

NAR download form hooked up.
Added a stream flow time series select which is disabled unless Stream
Flow is checked.

Constituent and water quality data type are now disabled if water
quality is unchecked. Fields are cleared as well

Using a form tag in the markup so we can more easily collect the
parameters.

Clear Filters now resets the whole form including dates.

Set minDate and maxDate on endDate and startDate respectively when the
startDate or endDate is updated. Clearing the form reset the minDate and
maxDate back to the defaults.
Merge pull request #265 from mbucknell/new-333

Added a stream flow time series select which is disabled unless Stream
Adding new variable with reasonable default.