Vector API additions Small UI changes, and SLD Styling 

Prevent fetch loop and fix paging

Spelling error

Co-authored-by: Jacob Cain <115182890+jrcain-usgs@users.noreply.github.com>

Pulling SLD files from a server so files are not needed

Leaflet.SLD addition and UI updates

fix bug when a default property is given, global map is now showing diffrent styles for different features

Fixes #24

added default styling to collections without stylesheets as wells as custom styling to collections with stylesheets

Fixes #20

symbols are being added initially/ on load more/ and when a selected collection is picked using the multi select box. Still having issues with symbols displaying using layer controls button. #21

symbols are being added on initial load/ load more/ and when the multi select box is clicked on. Still noit working when the control layers box is used