Consider serving logo.png over https!

[ghost]

Hi!

On first install it produces mixed content on login page. I would guess it turns off a lot of first time users.
Github now supports https on all github.io domains.

I would suggest to replace
http://hubpress.io/img/logo.png with
https://raw.githubusercontent.com/HubPress/site.hubpress.io/gh-pages/img/logo.png in
hubpress/scripts/app.js