File load error occurred .

Hi, I used httpclient-uploadio on Rails app.

The following error occurred  when update bundler after 1.3.0.pre:
```sh
$ rails s
/usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/httpclient-uploadio-1.0.0/lib/httpclient-uploadio.rb:1:in `require': cannot load such file -- httpclient-uploadio/version (LoadError)
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/httpclient-uploadio-1.0.0/lib/httpclient-uploadio.rb:1:in `<top (required)>'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:72:in `require'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:70:in `each'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:70:in `block in require'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:59:in `each'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler/runtime.rb:59:in `require'
        from /usr/local/opt/rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.4/lib/bundler.rb:132:in `require'
```