Migrate to Heroku Cedar stack

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-
+ruby "1.9.2"
 gem 'rails', '3.2.12'
 
 # Gems used only for assets and not required
@@ -22,9 +22,6 @@ gem 'jquery-rails'
 # To use Jbuilder templates for JSON
 # gem 'jbuilder'
 
-# Use unicorn as the app server
-# gem 'unicorn'
-
 # Deploy with Capistrano
 # gem 'capistrano'
 
@@ -39,6 +36,10 @@ gem 'will_paginate', '~> 3.0'
 gem 'activerecord-postgresql-adapter'
 gem 'pg'
 
+group :production do
+	gem 'unicorn'
+end
+
 group :development do
   gem 'meta_request' 
   gem 'better_errors'

Gemfile.lock

@@ -81,6 +81,7 @@ GEM
     json (1.7.7)
     jwt (0.1.5)
       multi_json (>= 1.0)
+    kgio (2.8.0)
     loofah (1.0.0)
       nokogiri (>= 1.3.3)
     mail (2.4.4)
@@ -127,6 +128,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.10.0)
     rake (10.0.3)
     rdoc (3.12.1)
       json (~> 1.4)
@@ -155,6 +157,10 @@ GEM
     uglifier (1.3.0)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)
+    unicorn (4.6.2)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     will_paginate (3.0.4)
 
 PLATFORMS
@@ -175,4 +181,5 @@ DEPENDENCIES
   sass-rails (~> 3.2.3)
   sorcery
   uglifier (>= 1.0.3)
+  unicorn
   will_paginate (~> 3.0)

config/initializers/mail.rb

@@ -1,9 +1,11 @@
-ActionMailer::Base.smtp_settings = {
-  :address        => 'smtp.sendgrid.net',
-  :port           => '587',
-  :authentication => :plain,
-  :user_name      => ENV['SENDGRID_USERNAME'],
-  :password       => ENV['SENDGRID_PASSWORD'],
-  :domain         => 'heroku.com'
-}
-ActionMailer::Base.delivery_method = :smtp
+if(Rails.env.production?)
+  ActionMailer::Base.smtp_settings = {
+    :address        => 'smtp.sendgrid.net',
+    :port           => '587',
+    :authentication => :plain,
+    :user_name      => ENV['SENDGRID_USERNAME'],
+    :password       => ENV['SENDGRID_PASSWORD'],
+    :domain         => 'heroku.com'
+  }
+  ActionMailer::Base.delivery_method = :smtp
+end