title: capifony's installing Composer dependencies failed
body: <p>i try to deploy my symfony2 project with the help of capifony</p>
  
  <pre><code>cap  deploy:setup
  </code></pre>
  
  <p>makes no problem and store on /var/www/htdocs/symfony-project two folders  </p>
  
  <pre><code>.symfony-project 
   .. releases
   .. shared
  </code></pre>
  
  <p>after that, when i try to run:</p>
  
  <pre><code>cap  deploy:cold
  </code></pre>
  
  <p>i get</p>
  
  <pre><code>--&gt; Updating code base with remote_cache strategy
  --&gt; Creating cache directory................................✔
  --&gt; Creating symlinks for shared directories................✔
  --&gt; Normalizing asset timestamps............................✔
  --&gt; Downloading Composer....................................✔
  --&gt; Installing Composer dependencies........................✘
  *** [deploy:update_code] rolling back
  failed: "sh -c 'sh -c '\\''cd /var/www/htdocs/symfony-project/releases/20130311124645 &amp;&amp;      
  php composer.phar install --no-scripts --verbose --prefer-dist --optimize-
  autoloader'\\'''" on webservername.net
  </code></pre>
  
  <p>and there are no folders in </p>
  
  <pre><code>var/www/htdocs/symfony-project/releases/
  </code></pre>
  
  <p>my deploy.rb is the following one:</p>
  
  <pre><code>set :user, "user"
  set :port, "12345"
  
  set :application, "Application Name"
  set :domain,      "webservername.net"
  set :deploy_to,   "/var/www/htdocs/symfony-project"
  set :app_path,    "app"
  
  
  set :repository,  "ssh://#{user}@webservername.net:#{port}/var/repos/symfony-project.git"
  set :scm,         :git
  set :branch,      "master"
  
  set :model_manager, "doctrine"
  
  role :web,        domain                        
  role :app,        domain                         
  role :db,         domain, :primary =&gt; true       
  
  set  :use_sudo,      false
  set  :keep_releases,  3
  
  set :deploy_via, :remote_cache
  
  set :use_composer, true
  </code></pre>
  
  <p>has anyone an Idea what could it be caused by?</p>