title: Can't downgrade bundler
body: <p>I try to install a project I cloned. When I do 'bundle install' I have the following message:</p>
  
  <pre><code>$ bundle install
  Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
  rails (= 3.0.0) ruby depends on
  bundler (~&gt; 1.0.0) ruby
  
  Current Bundler version:
  bundler (1.6.2)
  
  This Gemfile requires a different version of Bundler.
  Perhaps you need to update Bundler by running `gem install bundler`?
  </code></pre>
  
  <p>So i did the following:</p>
  
  <pre><code>gem uninstall bundler
  gem install bundler --version '1.0.0'
  Successfully installed bundler-1.0.0
  1 gem installed
  </code></pre>
  
  <p>I do 'bundle install', and I keep having the same message:</p>
  
  <pre><code>$ bundle install
  Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
  rails (= 3.0.0) ruby depends on
  bundler (~&gt; 1.0.0) ruby
  
  Current Bundler version:
  bundler (1.6.2)
  
  This Gemfile requires a different version of Bundler.
  
  Perhaps you need to update Bundler by running `gem install bundler`?
  </code></pre>
  
  <p>It seems that I cannot downgrade bundler to the '1.0.0' version, any idea?</p>