Restructures Perfetta directory to conform to Ghost configuration.

Hi, 
Your theme is great; however, it doesn't work as it is currently structured. Here's a screenshot of what appears after I install it: 

![screen shot 2014-04-20 at 12 53 01 pm](https://cloud.githubusercontent.com/assets/6133673/2751373/2f883ff4-c8ca-11e3-9aeb-11ef9446e548.png)

Here's a screenshot of your current directory structure: 

![screen shot 2014-04-20 at 12 53 45 pm](https://cloud.githubusercontent.com/assets/6133673/2751374/467cab78-c8ca-11e3-9ef2-6c90d1335b2b.png)

My pull request will remove the initial subdirectory perfetta and the README.md nested in the perfetta subdirectory: 

![screen shot 2014-04-20 at 12 54 08 pm](https://cloud.githubusercontent.com/assets/6133673/2751381/86847ade-c8ca-11e3-9f07-117f127f7f20.png)

Now everything works :)

![screen shot 2014-04-20 at 12 54 21 pm](https://cloud.githubusercontent.com/assets/6133673/2751382/8e5b5b74-c8ca-11e3-989e-731ee5976582.png)