title: vagrant-berkshelf no longer works after upgrade to vagrant 1.4
body: <p>I upgraded to the latest version of vagrant </p>
  
  <pre><code>$ vagrant -v
  Vagrant 1.4.1
  </code></pre>
  
  <p>Re-installed my plugins:</p>
  
  <pre><code># Uninstall plugins
  for i in vagrant-omnibus vagrant-chef-zero vagrant-berkshelf
  do vagrant plugin uninstall $i
  done
  
  # Install plugins
  for i in vagrant-omnibus vagrant-chef-zero vagrant-berkshelf
  do vagrant plugin install $i
  done
  
  $ vagrant plugin list
  vagrant-berkshelf (1.3.7)
  vagrant-chef-zero (0.5.2)
  vagrant-omnibus (1.2.1)
  </code></pre>
  
  <p>But the vagrant-berkshelf plugin doesn't load.</p>
  
  <pre><code>$ vagrant up
  Failed to load the "vagrant-berkshelf" plugin. View logs for more details.
  </code></pre>
  
  <p>Stacetrace</p>
  
  <pre><code>DEBUG environment: Loading plugins from: /home/mark/.vagrant.d/plugins.json
   INFO environment: Loading plugin from JSON: vagrant-omnibus
   INFO manager: Registered plugin: vagrant-omnibus
   INFO environment: Loading plugin from JSON: vagrant-chef-zero
   INFO manager: Registered plugin: chef_zero
   INFO environment: Loading plugin from JSON: vagrant-berkshelf
  ERROR root: Failed to load plugin: vagrant-berkshelf
  ERROR root:  -- Error: #&lt;Gem::LoadError: Unable to activate berkshelf-2.0.10, because ridley-2.4.0 conflicts with ridley (~&gt; 1.5.0)&gt;
  ERROR root:  -- Backtrace:
  ERROR root: /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:2007:in `raise_if_conflicts'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1176:in `activate'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1212:in `block in activate_dependencies'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `each'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `activate_dependencies'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/specification.rb:1180:in `activate'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems.rb:186:in `rescue in try_activate'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems.rb:183:in `try_activate'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:117:in `rescue in require'
  /opt/vagrant/embedded/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:124:in `require'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/lib/vagrant.rb:200:in `require_plugin'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/lib/vagrant/environment.rb:760:in `block in load_plugins'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/lib/vagrant/environment.rb:751:in `each'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/lib/vagrant/environment.rb:751:in `load_plugins'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/lib/vagrant/environment.rb:132:in `initialize'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/bin/vagrant:105:in `new'
  /opt/vagrant/embedded/gems/gems/vagrant-1.4.1/bin/vagrant:105:in `&lt;top (required)&gt;'
  /opt/vagrant/bin/../embedded/gems/bin/vagrant:23:in `load'
  /opt/vagrant/bin/../embedded/gems/bin/vagrant:23:in `&lt;main&gt;'
   INFO interface: error: Failed to load the "vagrant-berkshelf" plugin. View logs for more details.
  
  Failed to load the "vagrant-berkshelf" plugin. View logs for more details.
  </code></pre>
  
  <p>Does anyone know how to trouble-shoot gem conflicts between vagrant plugins?</p>
  
  <pre><code>ERROR root:  -- Error: #&lt;Gem::LoadError: Unable to activate berkshelf-2.0.10, 
     because ridley-2.4.0 conflicts with ridley (~&gt; 1.5.0)&gt;
  </code></pre>