application website validation, don't link to app website if website isn't set,
also comment out animated boost icon from #464 until it's consistent with non-animated version

Test for presence of Application in haml before trying to render details, to fix errors identified by CI

Add tracking of OAuth app that posted a status, extend OAuth apps to have optional website field, add application details to API, show application name and website on detailed status views. Resolves #11

with YAML-defined defaults. Add admin page for editing global settings. Add "site_description"
setting that would show as a paragraph on the frontpage

Fix #457 - escape JSON in INITIAL_STATE (this bug only ever allowed a user to xss themselves rather than anyone else)

fix bug in process feed service

Deduplicating some logic and switching to pluck, to avoid pulling the entire model in memory.