Fix scatterplot y-scale size and legend colors and labels 
* Update api to return max partner count as part of the metadata so that scales can be more easily sized.
* Move sub_area_counts method into model so that it is reusable
* Update scatter plot so that it uses proper domain and ranges when creating the legend
* Remove scale changes when sub area is changed
* Use first sub area in select list as the first data to display on page load.
Map schools to school_code where possible and update import to be based on school codes.