Revert "vim: add g:merlin_type_history_auto_close"

This reverts commit 68725ecd2e3b22352f7c9dbbe3151f603f895694.
vim: fix [merlin-type-history] clearing

Ugly ugly.
Merge pull request #337 from rgrinberg/master

set comments syntax in merlin config files
Redirect stderr with sexp protocol (fix #333)