Restructure gold info page

:eyeglasses: @bsimpson63 

Create 'is_top' property for features and partners. Features with is_top=true in the gold_features wiki will be shown above the partners list. Any partners with is_top=true will be shown. A link to the remaining partners is shown after the top partners. The rest of the features in other_features will be shown below top_partners.

![gold partners](https://cloud.githubusercontent.com/assets/5882173/5288406/72016eb0-7ae9-11e4-9355-b8f7d17999f2.png)

should this be marked for translation?