feature(repository): support deploy key API

close #376

Author: mironal

lib/Repository.js

@@ -550,6 +550,49 @@ class Repository extends Requestable {
       return this._request('DELETE', `/repos/${this.__fullname}/hooks/${id}`, null, cb);
    }
 
+   /**
+    * List the deploy keys for the repository
+    * @see https://developer.github.com/v3/repos/keys/#list-deploy-keys
+    * @param {Requestable.callback} cb - will receive the list of deploy keys
+    * @return {Promise} - the promise for the http request
+    */
+   listKeys(cb) {
+      return this._request('GET', `/repos/${this.__fullname}/keys`, null, cb);
+   }
+
+   /**
+    * Get a deploy key for the repository
+    * @see https://developer.github.com/v3/repos/keys/#get-a-deploy-key
+    * @param {number} id - the id of the deploy key
+    * @param {Requestable.callback} cb - will receive the details of the deploy key
+    * @return {Promise} - the promise for the http request
+    */
+   getKey(id, cb) {
+      return this._request('GET', `/repos/${this.__fullname}/keys/${id}`, null, cb);
+   }
+
+   /**
+    * Add a new deploy key to the repository
+    * @see https://developer.github.com/v3/repos/keys/#add-a-new-deploy-key
+    * @param {Object} options - the configuration describing the new deploy key
+    * @param {Requestable.callback} cb - will receive the new deploy key
+    * @return {Promise} - the promise for the http request
+    */
+   createKey(options, cb) {
+      return this._request('POST', `/repos/${this.__fullname}/keys`, options, cb);
+   }
+
+   /**
+    * Delete a deploy key
+    * @see https://developer.github.com/v3/repos/keys/#remove-a-deploy-key
+    * @param {number} id - the id of the deploy key to be deleted
+    * @param {Requestable.callback} cb - will receive true if the call is successful
+    * @return {Promise} - the promise for the http request
+    */
+   deleteKey(id, cb) {
+      return this._request('DELETE', `/repos/${this.__fullname}/keys/${id}`, null, cb);
+   }
+
    /**
     * Delete a file from a branch
     * @see https://developer.github.com/v3/repos/contents/#delete-a-file