Added PPA/Debian support

Added Debian packaging and PPA upload to launchpad. 
You need first to make sure your launchpad environment is set properly (OpenGPG key registered to a keyserver, then to launchpad etc.) and then you can build with UPLOAD_PPA=TRUE option : 
```Bash
cmake .. -DUPLOAD_PPA=TRUE
make
```
make will start the upload to launchpad, and or course build your package :)
Cheers,
Antoine