title: Rails bundler not installing spree gems
body: <p>I'm trying to create a new rails application that uses spree. I am trying to install the <code>spree_fancy</code> gem and was told to append it to my gemfile. </p>
  
  <p>Here is my gem file: </p>
  
  <pre><code>source 'https://rubygems.org'
  
  
  gem 'rails', '4.1.4'
  gem 'sqlite3'
  gem 'sass-rails', '~&gt; 4.0.3'
  gem 'uglifier', '&gt;= 1.3.0'
  gem 'coffee-rails', '~&gt; 4.0.0'
  
  gem 'jquery-rails'
  gem 'turbolinks'
  gem 'jbuilder', '~&gt; 2.0'
  gem 'sdoc', '~&gt; 0.4.0',          group: :doc
  
  gem 'spring',        group: :development
  
  
  gem 'spree', '2.3.1'
  gem 'spree_gateway', :git =&gt; 'https://github.com/spree/spree_gateway.git', :branch =&gt; '2-3-stable'
  gem 'spree_auth_devise', :git =&gt; 'https://github.com/spree/spree_auth_devise.git', :branch =&gt; '2-3-stable'
  
  gem 'spree_fancy', :git =&gt; 'git://github.com/spree/spree_fancy.git', :branch =&gt; '2-1-stable'
  </code></pre>
  
  <p>However, after running <code>bundle install</code>, I receive the following error: </p>
  
  <pre><code>Bundler could not find compatible versions for gem "spree_core":
    In Gemfile:
      spree_fancy (&gt;= 0) ruby depends on
        spree_core (~&gt; 2.1.0) ruby
  
      spree (= 2.3.1) ruby depends on
        spree_core (2.3.1)
  </code></pre>
  
  <p>How can i fix this? </p>
  
  <p><strong>UPDATE</strong>: </p>
  
  <p>As suggested, I changed the spree_fancy branch from 2.1 to 2.3, and I now have a new error</p>
  
  <pre><code>Bundler could not find compatible versions for gem "i18n":
    In snapshot (Gemfile.lock):
      i18n (0.6.11)
  
    In Gemfile:
      spree (= 2.3.1) ruby depends on
        spree_core (= 2.3.1) ruby depends on
          i18n (= 0.6.9) ruby
  </code></pre>