title: Your Gemfile lists the gem more than once. could cause errors
body: <p><strong>I am currently getting these messages below when i run bundle install</strong></p>
  
  <pre><code>Your Gemfile lists the gem sqlite3 (= 1.3.5) more than once.
  You should probably keep only one of them.
  While it's not a problem now, it could cause errors if you change the version of just one of them later.
  
  Your Gemfile lists the gem rspec-rails (= 2.10.0) more than once.
  You should probably keep only one of them.
  While it's not a problem now, it could cause errors if you change the version of just one of them later.
  
  Your Gemfile lists the gem rspec-rails (= 2.10.0) more than once.
  You should probably keep only one of them.
  While it's not a problem now, it could cause errors if you change the version of just one of them later.
  
  Your Gemfile lists the gem pg (= 0.12.2) more than once.
  You should probably keep only one of them.
  While it's not a problem now, it could cause errors if you change the version of just one of them later.
  </code></pre>
  
  <p>I am using Postgresql with Heroku and I believe I am using Postgresql in both my development and testing. I recently migrated/switched from sqlite to postgresql.</p>
  
  <p><strong>Do I still need the sqlite3 gems in :development or in :development, :test ?</strong></p>
  
  <p><strong>And lastly, is there a difference between :development &amp; :development, :test ?</strong></p>
  
  <p>database.yml</p>
  
  <pre><code>development:
    adapter: postgresql
    encoding: unicode
    database: xxxxxx_development
    pool: 5
    username: xxxxxx
    password:
  
  test:
    adapter: postgresql
    encoding: unicode
    database: xxxxxx_development
    pool: 5
    username: xxxxxx
    password:
  </code></pre>
  
  <p>Gemfile</p>
  
  <pre><code>gem 'rails', '3.2.11'
  gem "bootstrap-sass"
  gem 'will_paginate'
  gem 'bootstrap-will_paginate', '0.0.6'
  
  gem 'pg', '0.12.2'
  gem 'pg_search'
  
  group :development, :test do
    gem 'sqlite3', '1.3.5'
    gem 'rspec-rails', '2.10.0'
    gem 'guard-rspec', '0.5.5'
  end
  
  group :development do
    gem 'sqlite3', '1.3.5'
    gem 'rspec-rails', '2.10.0'
  end
  
  # Test gems on Macintosh OS X
  group :test do
    gem 'rspec-rails', '2.10.0'
  end
  
  group :production do
    gem 'pg', '0.12.2'
    gem 'rack-google_analytics'
  end
  </code></pre>