File editor

Hey, I'm using daux for docs that I need to change quite often, so I built this front end editor (basically just textarea with markdown).

You can enable/disable file editor with config. When enabled, it adds __Edit this file__ button to each page.

![snimek obrazovky 2014-01-20 v13 48 53](https://f.cloud.github.com/assets/1788727/1954191/44358884-81d1-11e3-859d-254b9fb81808.png)