Update to octicons 1.4.0

The only real change here is the `person-add` octicon, that is now deprecated. Used to look like so:

![screen shot 2014-05-15 at 00 24 07](https://cloud.githubusercontent.com/assets/211284/2978221/ae292c84-dbb6-11e3-97d9-3510237e68f9.png)

Without any changes, it will now look like so:

![screen shot 2014-05-15 at 00 23 47](https://cloud.githubusercontent.com/assets/211284/2978224/b52eeb2c-dbb6-11e3-9e45-3b11d750fa3b.png)

@fabianperez Want to change the icon here? Maybe to `organization`? Or push this one closer to the text?