Markdown editor with folders as local libraries I need beautiful editor that can 'import' more then one local folders as libraries. 

This would let me search files only from these folders/libraries. But the crucial thing is to have local folders as libraries. It's important to not have the tool impose a custom folder structure, just simple folder and its files.

The tools I've dismissed for the job are as follows:


http://writeapp.net/ - nice, but needs some issues to be fixed and more work to be put in. 
Ulysses, but I don't think it can use my folders as a libraries. EDIT: it is possible to add 'external source' to it, so for now this looks fine.
nvAlt (not an editor, but has search), but it can work with just one folder


What software might work for my needs?

EDIT

I am not asking for common Editor. I do use Sublime on projects, but I want to use something else for my notes - simply because I want to access them in explained way.
I use Sublime Text with the Markdown Preview package. 

It has Markdown syntax highlighting, color themes, and lets you treat directories as projects, allowing you to search over them, as you requested. The Preview package allows you to see the MD result in your choice of browser, with your choice of renderer (regular/GitHub). 

Sublime is very versatile and open to many more customizations, should you require them.