@shacker @yuhunglin Still need to find a way to better explain myself...
In this case it shouldn't be a problem.

We should use a button when we need to perform an action on the site: e.g. Adding a task / Showing more items / Entering a date.
More technically, we need to use buttons when the only thing they have is a `data-ng-click`. When they have an `href` it should be fine.

Have another look at #508 - you'll see that all the lement that I had to change were anchor tags with only an `href` on them.