Menu line compromise built with css borders

The previous TRIGRAM FOR HEAVEN, though elegant-looking, wasn't supported on all browsers.  See discussion here:   [https://github.com/HabitRPG/habitrpg/pull/3412](https://github.com/HabitRPG/habitrpg/pull/3412)

New solution à la this guide:  [http://css-tricks.com/three-line-menu-navicon/](http://css-tricks.com/three-line-menu-navicon/)

Here's what it looks like: 
![capture decran 2014-05-06 a 11 36 21 am](https://cloud.githubusercontent.com/assets/7093793/2891604/80ef6284-d534-11e3-9b43-c40d5d2a5bd5.png)