FIX: downgrade pg to stop memory leak

Gemfile

@@ -145,7 +145,10 @@ gem 'omniauth-github-discourse', require: 'omniauth-github'
 gem 'omniauth-oauth2', require: false
 gem 'omniauth-google-oauth2'
 gem 'oj'
-gem 'pg'
+# pg is downgraded while we investigate a severe memory issu
+#  during multi threading that shows up on 0.18.1
+# This also means we DO NOT work on Ruby 2.2 at the moment
+gem 'pg', '0.15.1'
 gem 'pry-rails', require: false
 gem 'rake'
 

Gemfile.lock

@@ -282,7 +282,7 @@ GEM
     openid-redis-store (0.0.2)
       redis
       ruby-openid
-    pg (0.18.1)
+    pg (0.15.1)
     polyglot (0.3.5)
     progress (3.0.1)
     pry (0.10.1)
@@ -508,7 +508,7 @@ DEPENDENCIES
   omniauth-twitter
   onebox
   openid-redis-store
-  pg
+  pg (= 0.15.1)
   pry-nav
   pry-rails
   puma