Fixed DejaVu Sans Mono fonts

The old `DejaVu Sans Mono for Powerline.otf` didn't work for me. The size didn't match the original font and there were issues withantialiasing. Also, the size of the font file was twice as large as the original DejaVu Sans Mono on my system. These patched versions should fix those issues (and also #11 and #21).

The original versions of these patched versions come from the ArchLinux distribution (`/usr/share/fonts/TTF/`).