support storing save_path in resume data

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@9999 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
add clients to identify_client

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10000 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda