Integrate SCHOOLDIGGER API

[ScrantonPete]

User Story

After I see results on the map, I want to click on the popup see the detailed school information, and choose whether or not to save as favorite.

Acceptance Criteria

• [ ] index.html lets you click on popup and that school's information is passed to SCHOOLDIGGER API
• [ ] index.html displays modal detailed school information from SCHOOLDIGGER API
• [ ] index.html modal lets you save school as favorite