project.el not work in 0.5

It used to work on 0.4, but with 0.5 I got error like this: ``` File is missing: RPC No such file File not found: /home/sunng/workspace/geodatafusion/.git [2 times] File is missing: /rpc:grepbeijing02:/home/sunng/workspace/geodatafusion/.git File is missing: RPC No such file File not found: /home/sunng/workspace/geodatafusion/.git File is missing: /rpc:grepbeijing02:/home/sunng/workspace/geodatafusion/.git [2 times] tramp-error: /rpc:grepbeijing02:/home/sunng/workspace/geodatafusion/.git ``` The `.git` directory is actually there.