add kaminari gem for pagination

Gemfile

@@ -8,11 +8,12 @@ gem 'therubyracer'
 gem 'bcrypt-ruby' # To use ActiveModel's has_secure_password
 gem 'sanitize'
 gem 'redcarpet'
-gem 'hirb' #pretty console output
+gem 'hirb' # pretty console output
 gem 'rb-readline'
 gem 'rest-client'
 gem 'activerecord-session_store'
 gem 'highlight_js-rails'
+gem 'kaminari' # pagination
 
 # Gems used only for assets and not required
 # in production environments by default.

Gemfile.lock

@@ -69,6 +69,9 @@ GEM
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
     json (1.8.1)
+    kaminari (0.16.1)
+      actionpack (>= 3.0.0)
+      activesupport (>= 3.0.0)
     kgio (2.9.2)
     libv8 (3.16.14.3)
     mail (2.5.4)
@@ -170,6 +173,7 @@ DEPENDENCIES
   highlight_js-rails
   hirb
   jquery-rails
+  kaminari
   mysql2
   rails (= 4.1.0)
   rails-erd