Adds bullet to dev & test, but makes it visible only on-demmand

The logs are always stored in log/bullet.log

If you run the specs with `BULLET=true bin/rspec`:
* Any feature test which makes bullet angry will fail

If you run rails with `BULLET=true bin/rails s`:
* It will print the bullet logs in both the rails log and the bullet log
* It will show a footer on each page with the N+1 queries etc.

config/environments/development.rb

@@ -44,4 +44,13 @@ Rails.application.configure do
   # config.action_view.raise_on_missing_translations = true
 
   config.cache_store = :null_store
+
+  config.after_initialize do
+    Bullet.enable = true
+    Bullet.bullet_logger = true
+    if ENV['BULLET']
+      Bullet.rails_logger = true
+      Bullet.add_footer = true
+    end
+  end
 end

config/environments/test.rb

@@ -45,4 +45,13 @@ Rails.application.configure do
   # config.action_view.raise_on_missing_translations = true
 
   config.cache_store = :null_store
+
+  config.after_initialize do
+    Bullet.enable = true
+    Bullet.bullet_logger = true
+    if ENV['BULLET']
+      Bullet.raise = true # raise an error if n+1 query occurs
+    end
+  end
+
 end

spec/spec_helper.rb

@@ -27,6 +27,15 @@ RSpec.configure do |config|
     DatabaseCleaner.clean
   end
 
+  config.before(:each, type: :feature) do
+    Bullet.start_request
+  end
+
+  config.after(:each, type: :feature) do
+    Bullet.perform_out_of_channel_notifications if Bullet.notification?
+    Bullet.end_request
+  end
+
   # Allows RSpec to persist some state between runs in order to support
   # the `--only-failures` and `--next-failure` CLI options.
   config.example_status_persistence_file_path = "spec/examples.txt"
@@ -57,4 +66,6 @@ RSpec.configure do |config|
   # test failures related to randomization by passing the same `--seed` value
   # as the one that triggered the failure.
   Kernel.srand config.seed
+
+
 end