Parent element title is suppressed if no title is given to the icon

[davep]

I suspect this will be related to #13.

Simply put, if you don't supply a title in a call to fontawesome_icon, the resulting HTML looks something like this:

<i title="" class="fa fa-square-o fa-fw"></i>

Because of the title="", any title set by the parent element is "ignored" by the browser. This means it's not possible to do things like this:

<button title="Here is some help">
  Press me! {% fontawesome_icon "square-o" fixed=True %}
</button>

and have the title text appear in a tooltip for the whole of the button -- it disappears if you mouse over the icon.