Brought Rendering to Center

In this pull request, I:
  - Brought coin rendering to center-right of header; makes it feel less crowded
  - Removed 'Javascript wallet generator' and put 'online wallet generator' there instead

![cat](https://f.cloud.github.com/assets/4841586/1823572/fe7b7ef8-7180-11e3-84b1-83ac25e0e22b.png)


If there is too much header padding for your liking, I can bring it down.
Meow! :smile_cat: