Add phpseclib sftp adapter

README.markdown

@@ -375,6 +375,47 @@ services:
         arguments: [@acme_test.ssh.session]
 ```
 
+## Phpseclib Sftp (phpseclib_sftp)
+
+Adapter for phpseclib SFTP (SSH-FTP).
+
+### Parameters
+
+ * `phpseclib_sftp_id` The id of the service that provides SFTP access.
+ * `directory` The remote directory *(default null)*.
+ * `create` Whether to create the directory if it does not exist *(default false)*.
+
+### Example
+
+``` yaml
+# app/config/config.yml
+knp_gaufrette:
+    adapters:
+        foo:
+            phpseclib_sftp:
+                phpseclib_sftp_id: acme_test.sftp
+                directory: /example/sftp
+                create: true
+```
+
+In your AcmeTestBundle, add following service definitions:
+
+``` yaml
+# src/Acme/TestBundle/Resources/config/services.yml
+parameters:
+    acme_test.ssh.host: my_host_name
+    acme_test.ssh.username: user_name
+    acme_test.ssh.password: some_secret
+
+services:
+    acme_test.sftp:
+        class: Net_SFTP
+        arguments: [%acme_test.ssh_host%]
+        calls:
+            - [login, [%acme_test.ssh.username%, %acme_test.ssh.password%]]
+
+```
+
 ## Apc (apc)
 
 Adapter for APC.