sqliteをgemfileから取り除く

Gemfile

@@ -3,9 +3,6 @@ source 'https://rubygems.org'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '4.0.1'
 
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3'
-
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 4.0.0'
 
@@ -52,6 +49,9 @@ gem 'omniauth-google-oauth2'
 gem 'redcarpet'
 
 group :development do
+  # Use sqlite3 as the database for Active Record
+  gem 'sqlite3'
+
   gem 'better_errors'
   gem 'binding_of_caller'