Updated to cleanup with hydrograph line rendering and to create a consistent set of elements that will be rendered that can be used by the graph server to determine when rendering is complete.

Fix test for python 3.6

Removed the browserstack badge

Remove Browserstack badge

Merge master into refactor

Release 0301

Deps 0301

Merge gw approvals

Merged the groundwater approval code and refactored to keep all of the info needed to render tooltips, legend data and groundwater visit circles in selectors/discrete-data.js

Fixed conversion of celsius 0 to Fahrenheit.

Wdfn 501

Made the compare toggle disabled when custom date range or period. Fixed some issues that occurred while switching time periods that cause the primary parameter to be null. Also eliminated an needed service calls when that data is not requested or not available.

Wdfn 501 - Cleaned up the code, all tests run, tests were added for new functions