Rh column on the test page

I improved the way how the RH components are shown on the test page (http://m.code.dev-theguardian.com/commercial/test-page)

The rh component is now shown in the proper column on the right side of the article (only on the 
'Articles' layout):
![screen shot 2014-12-16 at 11 38 15](https://cloud.githubusercontent.com/assets/489567/5452873/1e3f8756-8518-11e4-9ad2-98386d2f27b7.png)

On the top of the page, there is an additional dropdown, where you can select specific component (soulmates, jobs or membership):
![screen shot 2014-12-16 at 11 41 39](https://cloud.githubusercontent.com/assets/489567/5452910/7bb53f52-8518-11e4-93a2-4e05159393da.png)

I also added the additional parameter 'showEverywhere' which indicates if you are willing to show rh component on every page. If the 'showEverywhere' is false then the rh component will be shown only on a page with certain rules.
or `$`, as you're using `querySelector`