How are you concluding that? My load path suggests that it should be using the local code not the system gem, and loading it seems to confirm:

```
evan@caron:~/stripe/stripe-ruby (master)$ bundle exec irb
irb(main):001:0> $:
=> ["/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/test-unit-2.5.0/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/shoulda-3.3.2/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/shoulda-matchers-1.4.1/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/shoulda-context-1.0.1/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/mocha-0.13.0/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/mime-types-1.19/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/metaclass-0.0.1/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/multi_json-1.3.7/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/i18n-0.6.1/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rake-10.0.2/lib", "/home/evan/stripe/stripe-ruby/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/site_ruby/1.9.1", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/site_ruby/1.9.1/x86_64-linux", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/site_ruby", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/vendor_ruby/1.9.1", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/vendor_ruby/1.9.1/x86_64-linux", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/vendor_ruby", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1", "/home/evan/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/x86_64-linux"]
irb(main):002:0> require 'stripe'
=> true
irb(main):003:0> Stripe::Customer.method(:all).source_location
=> ["/home/evan/stripe/stripe-ruby/lib/stripe/api_operations/list.rb", 5]
```