[#63466128] Adds a page to the knowledge base explaining the different order statuses on store.

![fullscreen_1_20_14__12_28_pm](https://f.cloud.github.com/assets/2251119/1956974/acd1db48-8200-11e3-93c5-729a2ce38edf.jpg)

![fullscreen_1_20_14__12_28_pm](https://f.cloud.github.com/assets/2251119/1956981/b8477a78-8200-11e3-8c56-de520b0dc570.jpg)