[PATCH 5 of 6] config: give it a mapfile option, for parsing them specially

[Jordi Gutiérrez Hermoso]

On Sat, 2015-05-02 at 19:49 +0900, Yuya Nishihara wrote:
> Instead of making config know how templater works, how about passing
> includepaths to config.config() ?

Oh, good idea. That's certainly cleaner. I'll rework the whole patch.