Edit descriptions for several sites

While working on #815, I noticed that the site redesign made it harder to evaluate the choices you're offered. See this:

![2014-01-10_11 48 29](https://f.cloud.github.com/assets/1310872/1890923/f81eec8c-7a33-11e3-9510-00bd543a6ec4.png)

What's the difference between these three services? It's harder to tell now. I made some edits to a lot of these services to remove redundant information (the name of each service is already shown above it, and I assumed that things like "private" and "open source" and "secure" were implied as a result of their inclusion on the site). The goal was to move as much info *before* the ellipsis as possible.

After:

![2014-01-10_12 15 08](https://f.cloud.github.com/assets/1310872/1890924/fb8557a8-7a33-11e3-8997-8fc8fed2d8dc.png)

For the record, I made edits to a lot of descriptions, not just the ones pictured.