Backend cleanup (#146)

* Add ServerRegistration, begin refactoring to match frontend

* move graphData logic into ServerRegistration

* move ping updates/history into ServerRegistration

* start updating main app entry methods

* fix default rates.updateMojangStatus

* fix record loading delays on freshly booted instances

* move database loading logic to method + callback

* use data in frontend for type lookup instead of ping

* cleanup app.js

* reorganize methods to improve flow

* avoid useless mojang updates, remove legacy fields

* rename legacy fields for consistency

* finish restructure around App model

* ensure versions are sorted by release order

* filter errors sent to frontend to avoid data leaks

* fix version listing behavior on frontend

* 5.1.0

scripts/start.sh

@@ -1,5 +1,5 @@
 while true;
 do
-        node app.js 
+        node main.js 
         sleep 5
 done