Issue title: Can't open files from :Gstatus 
 Issue body: I've commented out my extras in my .vimrc and removed other bundles, still can't open anything out of the :Gstatus window- `-`, `o`, and `enter` get no response. Other commands (:Gwrite, read, add) are working fine. Git 2.0.0

 Comments: 
 Comment 0: What does `:nmap <buffer> <CR>` report?

 Comment 1: Returns: No mapping found

 Comment 2: Sorry, inside the :Gstatus window: 
n  <CR>        *@:<C-U>exe <SNR>25_GF("edit")<CR>                                                                                                                                                          

 Comment 3: Does `dp` work?

 Comment 4: Yes it does.

 Comment 5: What locale are you in? What is the contents of the status buffer?

 Comment 6: EN/US
http://cl.ly/image/212Q2w0x3l3u/Image%202014-06-28%20at%205.43.55%20PM.png

 Comment 7: Upgrade.

 Comment 8: I re-cloned the repo after seeing [#483](https://github.com/tpope/vim-fugitive/issues/483). Syntax and commands working now, it must be my bootstrap. Thanks.

{'source': 'GithubIssues', 'repo_name_with_owner': 'tpope/vim-fugitive', 'issue_id': 36735308, 'repo_stars': 16694.0}