Added Docker-PHP to the list of client libs

Docker-DCO-1.1-Signed-off-by: Geoffrey Bachelet <geoffrey.bachelet@gmail.com> (github: ubermuda)

docs/sources/reference/api/remote_api_client_libraries.rst

@@ -43,3 +43,5 @@ and we will add the libraries here.
 +----------------------+----------------+--------------------------------------------+----------+
 | PHP                  | Alvine         | http://pear.alvine.io/ (alpha)             | Active   |
 +----------------------+----------------+--------------------------------------------+----------+
+| PHP                  | Docker-PHP     | http://stage1.github.io/docker-php/        | Active   |
++----------------------+----------------+--------------------------------------------+----------+