adds dejavusans extralight font

Closes #555 

To check diacritics, ckey: 10431201
#### Various places where the font is now added
![screen shot 2014-08-14 at 6 36 13 am](https://cloud.githubusercontent.com/assets/1656824/3920607/4b3d0b6e-23b8-11e4-865f-cb81719ba5f9.png)
![screen shot 2014-08-14 at 6 35 54 am](https://cloud.githubusercontent.com/assets/1656824/3920608/4b3ec472-23b8-11e4-905f-b31579d3f3fb.png)
![screen shot 2014-08-14 at 6 35 51 am](https://cloud.githubusercontent.com/assets/1656824/3920611/4b47ac04-23b8-11e4-8ca9-4d539d7d0923.png)
![screen shot 2014-08-14 at 6 35 44 am](https://cloud.githubusercontent.com/assets/1656824/3920609/4b3f5694-23b8-11e4-9f4f-5338df42a4da.png)
![screen shot 2014-08-14 at 6 35 36 am](https://cloud.githubusercontent.com/assets/1656824/3920612/4b4a35fa-23b8-11e4-8ba9-d38e0ff3ddf3.png)
![screen shot 2014-08-14 at 6 35 24 am](https://cloud.githubusercontent.com/assets/1656824/3920610/4b3f9136-23b8-11e4-8a76-c1ea99c11c8c.png)