Bump version of cartodb-common to v0.3.6

This brings a couple fixes to the logger:

- it removes the hardcoded component "central.rails_server" from the
logs. See https://github.com/CartoDB/cartodb-common/pull/10

- it fixes a bug formatting non-utf bytestrings sequences. See
https://github.com/CartoDB/cartodb-common/pull/11

Gemfile

@@ -64,7 +64,7 @@ gem 'gibbon',                  '1.1.4'
 gem 'instagram-continued-continued'
 gem 'google-cloud-pubsub', '1.2.0'
 gem 'virtus',                   '1.0.5'
-gem 'cartodb-common', git: 'https://github.com/cartodb/cartodb-common.git', tag: 'v0.3.4'
+gem 'cartodb-common', git: 'https://github.com/cartodb/cartodb-common.git', tag: 'v0.3.6'
 gem 'email_address',            '~> 0.1.11'
 gem 'redcarpet', '3.3.3'
 gem 'rollbar',               '~>2.11.1'

Gemfile.lock

@@ -8,10 +8,10 @@ GIT
 
 GIT
   remote: https://github.com/cartodb/cartodb-common.git
-  revision: 341004053e7198ab1021fb0722de18acd4a09520
+  revision: d6f603d4324587de1ae0b60af14856e2935af75c
-  tag: v0.3.4
+  tag: v0.3.6
   specs:
-    cartodb-common (0.3.0)
+    cartodb-common (0.3.6)
       activesupport (~> 4.2.11.3)
       argon2 (~> 2.0)