CLC-3369 Move FinAid caching from proxy to model layer
CLC-3369 Make test pass
Merge pull request #2209 from ctweney/clc-3369

CLC-3369 Improve FinAid performance
added the fake xml for the app alerts feature
added app_alerts_proxy settings to main config file including a feature flag, a 2 minute expiration time, a fake mode option, and an api url
added AppAlertsProxy class