add rack-mini-profiler

Gemfile

@@ -126,6 +126,7 @@ group :development do
   gem 'localeapp'
   gem 'skype'
   #gem 'ruby-dbus' if RUBY_PLATFORM =~ /linux/i # Error at deploy
+  gem 'rack-mini-profiler', require: false
 end
 
 group :development, :test do

Gemfile.lock

@@ -354,6 +354,8 @@ GEM
     rack (1.5.2)
     rack-contrib (1.2.0)
       rack (>= 0.9.1)
+    rack-mini-profiler (0.9.3)
+      rack (>= 1.1.3)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
@@ -637,6 +639,7 @@ DEPENDENCIES
   protected_attributes
   puma
   pundit
+  rack-mini-profiler
   rack-throttle (~> 0.3.0)
   rack-utf8_sanitizer
   rails (= 4.1.10)

config/initializers/rack_profiler.rb

@@ -0,0 +1,6 @@
+if Rails.env == 'development'
+  require 'rack-mini-profiler'
+
+  # initialization is skipped so trigger it
+  Rack::MiniProfilerRails.initialize!(Rails.application)
+end