Add faker gem, don't require rubocop

Gemfile

@@ -174,13 +174,17 @@ gem 'cloudinary'
 # for setting app configuration in the environment
 gem 'dotenv-rails'
 
+# for fake data
+# this is not in a group as we use it also for rake data:demo
+gem 'faker'
+
 # Use guard and spring for testing in development
 group :development do
   # to launch specs when files are modified
   gem 'guard-rspec', '~> 4.2.8'
   gem 'spring-commands-rspec'
   # for static code analisys
-  gem 'rubocop'
+  gem 'rubocop', require: false
   # to silence rack assests messages
   gem 'quiet_assets'
   # as database

Gemfile.lock

@@ -173,6 +173,8 @@ GEM
     factory_girl_rails (4.6.0)
       factory_girl (~> 4.5.0)
       railties (>= 3.0.0)
+    faker (1.6.1)
+      i18n (~> 0.5)
     faraday (0.9.0)
       multipart-post (>= 1.2, < 3)
     fastimage (2.0.0)
@@ -550,6 +552,7 @@ DEPENDENCIES
   devise_ichain_authenticatable
   dotenv-rails
   factory_girl_rails
+  faker
   font-awesome-rails
   formtastic (~> 3.1.1)
   formtastic-bootstrap