Add hubiC.app v0.2.5

While looking for an [alternative to Dropbox](https://docs.google.com/document/d/14h1N5XLWsahFWxehRIw7y32GJLOD5KGpdvwQHjr5UxQ/edit#), I tried [hubiC](https://hubic.com) and created the associated cask.