Manage your processes

This pull add the ability to control you processes. The x button will first try to terminate, then kill the process.
If HTPC-Manager is started with --shell, a new div will show below the table where you can enter commands.
p1
![base](https://f.cloud.github.com/assets/1214134/2493065/be62dcda-b276-11e3-986c-c88b56b4fc8b.png)

p2
![confirm](https://f.cloud.github.com/assets/1214134/2493066/c5d6792c-b276-11e3-933b-dc474d9fd08a.png)

p3
![notify](https://f.cloud.github.com/assets/1214134/2493067/d71acfe4-b276-11e3-931f-8aee546049c9.png)

p4
![output2](https://f.cloud.github.com/assets/1214134/2493068/dd39bf8e-b276-11e3-8338-1c006019b1bf.png)