Merge branch 'master' into redux-integration

assets/src/scripts/components/hydrograph/index.js

assets/src/scripts/components/hydrograph/index.spec.js

assets/src/scripts/components/hydrograph/scales.js

assets/src/scripts/components/hydrograph/scales.spec.js

assets/src/scripts/components/hydrograph/store.js

assets/src/scripts/index.js

assets/src/scripts/models.js

assets/src/scripts/models.spec.js

assets/src/scripts/utils.js

assets/src/scripts/utils.spec.js

assets/src/styles/_uswds.scss

assets/src/styles/components/_hydrograph.scss

package-lock.json

package.json