Mismatch between unicode codes of ubuntu icon
There's apparently a mismatch between the unicode declare for the ubuntu icon in `src/icons/icons.yml`:

```
  - name:       Ubuntu
    id:         ubuntu
    unicode:    f36b
```

and what we get in `fonts/forkawesome-webfont.svg` after building the font:

```
<glyph glyph-name="ubuntu" unicode="&#xf36f;" horiz-adv-x="1280"
```

Other icons have the same code, e.g. `icons.yml` has:

```
  - name:       Debian
    id:         debian
    unicode:    f2ff
```
and this is `fonts/forkawesome-webfont.svg`:
```
<glyph glyph-name="debian" unicode="&#xf2ff;" horiz-adv-x="1440"
```

Cc: @mrdrogdrog