Remove sort order context menu

Why would anyone want to sort in ascending order. Remove this two items from the context menu to simplify it.
Do we have telemetry for these actions so I can prove my thinking that nobody is clicking on these actions

![screen shot 2017-04-11 at 18 02 08](https://cloud.githubusercontent.com/assets/1926584/24918529/049f1f54-1ee1-11e7-9696-90e21ff4c49c.png)
