fix: pie chart on landing page

* create latest scope to show only 3 entries on landing page
* pie chart now calculates all categories

Pie chart on landing page now shows more then 3 categories but only 3 entries show up on landing page.
![screen shot 2013-09-18 at 10 45 04 am](https://f.cloud.github.com/assets/331004/1166009/9cdf4d34-2075-11e3-8274-b0ac39f362aa.png)