Create device model and setup devise, activeadmin and rspec!

- with attributes: model, imei_number, unique_id and access_token
 - access_token is automatically generated on create

Gemfile

@@ -22,6 +22,8 @@ gem 'jbuilder', '~> 2.0'
 gem 'sdoc', '~> 0.4.0', group: :doc
 
 gem 'pg'
+gem 'devise'
+gem 'activeadmin', github: 'activeadmin'
 
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
@@ -33,8 +35,10 @@ gem 'pg'
 # gem 'capistrano-rails', group: :development
 
 group :development, :test do
-  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug'
+  gem 'rspec-rails'
+  gem 'factory_girl_rails'
+  gem 'shoulda-matchers'
 end
 
 group :development do