Make process available via getter

[bambamboole]

Fixes #90 by exposing the process via a stateful getter which gets reset on runProcess

[maschmann]

This PR introduces two changes. the return to sprintf'ing the hosts and also an exposed getter for symfony process.
I'd prefer to keep the process hidden within the wrappers and fixing the STDOUT issue from #90 in another way (see comment).
The host sprintf I'd gladly accept :-)

[bambamboole]

let me update the PR :)

[bambamboole]

AH I think the stuff was in the other PR. let me close this for now. Looking forward to the new release.

[maschmann]

You had both changes within this one, I guess (757b226)