title: uninitialized constant Bundler with pod init
body: <p>I'm trying to run <code>pod init</code> in a new xcode project. But I'm getting the error:</p>
  
  <pre><code>.rvm/gems/ruby-2.2.3/gems/bundler-1.13.2/lib/bundler/rubygems_ext.rb:45:in `full_gem_path': uninitialized constant Bundler::Plugin::API::Source (NameError)
      from /Users/nicholasstephan/.rvm/rubies/ruby-2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/basic_specification.rb:144:in `block in full_require_paths'
      from /Users/nicholasstephan/.rvm/rubies/ruby-2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/basic_specification.rb:143:in `map'
      from /Users/nicholasstephan/.rvm/rubies/ruby-2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/basic_specification.rb:143:in `full_require_paths'
      from /Users/nicholasstephan/.rvm/rubies/ruby-2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/basic_specification.rb:76:in `contains_r
  </code></pre>
  
  <p>I've re-installed bundler with <code>sudo gem install bundler</code> a couple of times.</p>
  
  <p>Is this an <code>rvm</code> issue? What's going on? </p>
  
  <p>Thanks.</p>