Restyle of the interface

Ok sorry for the mess, I've deleted my old fork and I can't update it anymore ^_^"

I've tried to make everything in a single commit (without luck) and I've moved the **Bash** button in the git-panel.

Here two screenshots of the extension on not-inited and inited repositories.

![image](https://f.cloud.github.com/assets/5382443/2147790/5a5e9ca4-93d8-11e3-84fd-ad214e45dccb.png)

![image](https://f.cloud.github.com/assets/5382443/2147793/712b74de-93d8-11e3-96df-9d9f443bec9e.png)

Just ignore my old pull request.