Started to re-design ProposedSpeakers#index

So i'm unhappy with the proposed speakers design.
People will probably not propose lots of speakers anyways.

Looks like this:
![screen shot 2014-03-15 at 11 51 21](https://f.cloud.github.com/assets/491230/2428149/36e618cc-ac30-11e3-991d-c23cfac858b7.png)

Opinions? cc @myabc @wordgraphy 

Still doesn't solve the problem of long reasons.