Add in oxford commas for researc/search in a more accurate

See: https://github.com/GigaOM/legacy-pro/issues/2491

Here's the result:
![screen shot 2014-02-24 at 10 34 44 am](https://f.cloud.github.com/assets/430385/2246899/361b85ec-9d69-11e3-8678-36858d0fb3cc.png)
![screen shot 2014-02-24 at 10 33 47 am](https://f.cloud.github.com/assets/430385/2246886/1b186012-9d69-11e3-97f1-562e33800bac.png)
![screen shot 2014-02-24 at 10 33 09 am](https://f.cloud.github.com/assets/430385/2246887/1b18a068-9d69-11e3-9e65-61fa41591241.png)