Hide 'Do not display on public timeline' for reply toots

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 Vagrantfile so that the correct ruby is installed

Prior to this commit, the vagrantfile installs ruby 2.3.3. Due to commit mastodon@7951e7f, this no longer works.

Change the provision scrip so that 2.3.1 is installed via rbenv. Note this drastically increases provision time.

fix bug in process feed service

Fix repo URL

simplify emojification on public pages with .emojify class

Add call-to developers on getting started page

Expand dropdown leftways on status view

Simplifying followers mappings

Less complicated determination of subscription

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

Fix Vagrantfile to include yarn

Using "rails style" order arguments