add wildlife habitats

[evankart]

add ability to overlay wildlife habitats to the map area.

• checkboxes for whether to show each dataset on the map
• automate looping through animals to add to map
• consider adding other data sources as well - land ownership, vegetation cover, rainfall, etc

[evankart]

added all wildlife range datasets to data sources and loop through to add all to map. need to add checkboxes or search box to select for specific animals.

also still need to add other types of data sources