Firefox and FirefoxOS autodiscovery

It automatically detects ports to connect for Firefox and FirefoxOS.
However the dependency with psutil is quite tricky to solve.

To install ps util
```
wget https://pypi.python.org/packages/source/p/psutil/psutil-2.1.1.tar.gz
tar xvf psutil-2.1.1.tar.gz
cd psutil*
make install
```