add new titles for otm_content

This PR addresses Steve Ebin's request:   https://optimizely.atlassian.net/browse/MKT-831

- create new titles for otm_content = brand and eo.
- hide text content below these titles

### otm_content=eo
![screen shot 2014-11-21 at 10 27 32 am](https://cloud.githubusercontent.com/assets/4656726/5147310/72718ae4-7169-11e4-908b-9313d8b1f9ed.png)

### otm_content=brand
![screen shot 2014-11-21 at 10 27 20 am](https://cloud.githubusercontent.com/assets/4656726/5147311/72750bb0-7169-11e4-822a-51e512d1819d.png)

### result
![screen shot 2014-11-21 at 10 25 54 am](https://cloud.githubusercontent.com/assets/4656726/5147312/7276de9a-7169-11e4-8579-96f24896f3fb.png)


Do we ever want text to appear without a heading? If no, then we might want to put this conditional inside the above conditional for defensive programming.