Bump onebox version.

- use custom placeholder HTML for generic whitelisted oneboxes
- optimize usage of custom placeholder HTML

Gemfile

@@ -46,7 +46,7 @@ gem 'redis-namespace'
 
 gem 'active_model_serializers', '~> 0.8.3'
 
-gem 'onebox', '1.9.1'
+gem 'onebox', '1.9.2'
 
 gem 'http_accept_language', '~>2.0.5', require: false
 

Gemfile.lock

@@ -238,7 +238,7 @@ GEM
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
       rack
-    onebox (1.9.1)
+    onebox (1.9.2)
       htmlentities (~> 4.3)
       moneta (~> 1.0)
       multi_json (~> 1.11)
@@ -487,7 +487,7 @@ DEPENDENCIES
   omniauth-oauth2
   omniauth-openid
   omniauth-twitter
-  onebox (= 1.9.1)
+  onebox (= 1.9.2)
   openid-redis-store
   parallel_tests
   pg