GET /repos/:user/:repo/keys

<%= headers 200 %> <%= json(:public_key) { |h| [h] } %>

GET /repos/:user/:repo/keys/:id

<%= headers 200 %> <%= json :public_key %>

POST /repos/:user/:repo/keys

<%= json :title => "octocat@octomac", :key => "ssh-rsa AAA..." %>

<%= headers 201, :Location => "https://api.github.com/user/repo/keys/1" %> <%= json :public_key %>

PATCH /repos/:user/:repo/keys/:id

<%= json :title => "octocat@octomac", :key => "ssh-rsa AAA..." %>

<%= headers 200 %> <%= json :public_key %>

DELETE /repos/:user/:repo/keys/:id

<%= headers 204 %>