add meta_request gem for debugging

Gemfile.lock

@@ -91,6 +91,7 @@ GEM
     bullet (4.9.0)
       activesupport
       uniform_notifier (~> 1.6.0)
+    callsite (0.0.11)
     capistrano (3.2.1)
       i18n
       rake (>= 10.0.0)
@@ -201,6 +202,10 @@ GEM
       skinny (>= 0.1.2)
       sqlite3-ruby
       thin
+    meta_request (0.3.0)
+      callsite
+      rack-contrib
+      railties
     mime-types (1.25.1)
     mini_portile (0.5.3)
     minitest (4.7.5)
@@ -224,6 +229,8 @@ GEM
     quiet_assets (1.0.2)
       railties (>= 3.1, < 5.0)
     rack (1.5.2)
+    rack-contrib (1.1.0)
+      rack (>= 0.9.1)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.2)
@@ -416,6 +423,7 @@ DEPENDENCIES
   less-rails
   localize_input!
   mailcatcher
+  meta_request
   mysql2
   prawn
   protected_attributes