Fix Firefox icon, onclick icon, whitespace

[jasonkliu]

This is a continuation of the pull #35.
The icon pulled from Fontello did not work using the svg font, so it was replaced with a woff font.
In addition, the issue with the broken playground link was resolved as follows:

• The icon has no href in the html file.
• When a successful run or error message is shown, the output is displayed as well as the icon (still with no href).
• When the icon is clicked, it calls the javascript function goPlayground() which loads the contents of the editor, encodes the URL, and navigates to the playground.

[brson]

Thanks for the quick update!

[jasonkliu]

No problem, I was able to fix all of the issues. I was looking at the problem the wrong way initially and didn't know that a solution was available as described above. Thanks for merging!