Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
	app/models/status.rb
	db/migrate/20180528141303_fix_accounts_unique_index.rb
	db/schema.rb

Resolved by taking upstream changes (no real conflicts, just glitch-soc
specific code too close to actual changes).

.env.production.sample

@@ -165,6 +165,7 @@ STREAMING_CLUSTER_NUM=1
 # LDAP_BIND_DN=
 # LDAP_PASSWORD=
 # LDAP_UID=cn
+# LDAP_SEARCH_FILTER="%{uid}=%{email}"
 
 # PAM authentication (optional)
 # PAM authentication uses for the email generation the "email" pam variable