title: Bundler::GemfileNotFound whenever I try to run bundle install
body: <p>I'm working in kali-linux (a linux distro witch is the continuation of Back-Track, based in Ubuntu, just that now is based on Debian wheezy) for some penetration testing. Everything was working just fine, until I decided to update my systems tools. Now whenever I try to run a tool based on ruby, it trows me:</p>
  
  <pre><code>Could not find gem 'ruby-progressbar (&gt;= 1.1.0) ruby' in the gems available on this machine.
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p>I proceed to run <code>bundle install</code> but then it comes with <code>Bundler::GemfileNotFound</code> error.</p>
  
  <p>Kali use by default ruby, for using gems. The software don't 'require' any other package but ruby seems not-fully-configured/installed for the problem at hand.</p>
  
  <pre><code>$ ruby --version
  ruby 1.9.3p194 (2012-04-20 revision 35410) [i486-linux]
  $ rvm
  bash: rvm: command not found
  $ rbenv
  bash: rbenv: command not found
  </code></pre>