Append '.git' to uris for short form repos

Uris for repos specified as user/repo end up being https://github.com/user/repo. For some reason, github allows cloning from such uris, however, it is better to rely on the addresses that github provide for cloning, and those include the trailing .git

This change appends .git to github repo uris when needed.

autoload/vundle/config.vim

@@ -44,6 +44,9 @@ func! s:parse_name(arg)
   if    arg =~? '^\s*\(gh\|github\):\S\+'
   \  || arg =~? '^[a-z0-9][a-z0-9-]*/[^/]\+$'
     let uri = 'https://github.com/'.split(arg, ':')[-1]
+    if uri !~? '\.git$'
+      let uri .= '.git'
+    endif
     let name = substitute(split(uri,'\/')[-1], '\.git\s*$','','i')
   elseif arg =~? '^\s*\(git@\|git://\)\S\+' 
   \   || arg =~? '\(file\|https\?\)://'