RTF Event Summary document

• Add button to download an RTF event summary document for post earthquake response
• Add "Population Exposure" table and tweak the layout of Mainshock products
• Add map popups to FM, MT beachball layers
• Create new Feeds / Feed classes for fetching data shown only in RTF Summary
• Add support for dependencies if other feature(s) need to be fetched first
• Add destroy method to all Features/Feeds
• Display tweaks on edit, summary, help panes
• Code cleanup/optimization
• Bug fixes