Update vim plugin to use Go binary

plugin/fzf.vim

@@ -1,4 +1,4 @@
-" Copyright (c) 2014 Junegunn Choi
+" Copyright (c) 2015 Junegunn Choi
 "
 " MIT License
 "
@@ -25,6 +25,7 @@ let s:min_tmux_width  = 10
 let s:min_tmux_height = 3
 let s:default_tmux_height = '40%'
 let s:launcher = 'xterm -e bash -ic %s'
+let s:fzf_go = expand('<sfile>:h:h').'/bin/fzf'
 let s:fzf_rb = expand('<sfile>:h:h').'/fzf'
 
 let s:cpo_save = &cpo
@@ -34,7 +35,8 @@ function! s:fzf_exec()
   if !exists('s:exec')
     call system('type fzf')
     if v:shell_error
-      let s:exec = executable(s:fzf_rb) ? s:fzf_rb : ''
+      let s:exec = executable(s:fzf_go) ?
+            \ s:fzf_go : (executable(s:fzf_rb) ? s:fzf_rb : '')
     else
       let s:exec = 'fzf'
     endif