エラーが発生しました。Github APIを操作するGemを追加する必要があります。Crowdsourcingでは下記のGemを使っていました。

peter-murach/github
https://github.com/peter-murach/github

```
NameError (uninitialized constant Provider::Github):
  app/models/provider.rb:7:in `github'
  app/models/project_github.rb:10:in `add_issue'
  app/controllers/issues_controller.rb:30:in `block in create'
  app/controllers/issues_controller.rb:27:in `create'


  Rendered /Users/kotamiyake/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.7ms)
  Rendered /Users/kotamiyake/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
  Rendered /Users/kotamiyake/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.1ms)
  Rendered /Users/kotamiyake/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (19.0ms)
```

@pandeiro245