Commercial capi standfirst

This adds the stand-first from an article to the commercial content API component as requested by the commercial team.

Before;
![screen shot 2014-09-01 at 17 06 54](https://cloud.githubusercontent.com/assets/1303616/4110428/243affc4-31f2-11e4-84b5-db6f891460b0.png)

After
![screen shot 2014-09-01 at 17 06 04](https://cloud.githubusercontent.com/assets/1303616/4110432/2f637c50-31f2-11e4-8b2c-04dbfd249db9.png)