Implement :JediChooseEnvironment

plugin/jedi.vim

@@ -53,6 +53,9 @@ endif
 " Pyimport command
 command! -nargs=1 -complete=custom,jedi#py_import_completions Pyimport :call jedi#py_import(<q-args>)
 
+command! -nargs=? -complete=file JediChooseEnvironment :call jedi#choose_environment(<q-args>)
+
+
 function! s:jedi_debug_info()
     " Ensure the autoload file has been loaded (and ignore any errors, which
     " will be displayed with the debug info).