Quote composite variables

Just in case these variables change or include dodgy characters
Merge pull request #9 from kehh/master

Quote composite variables
Restart php5-fpm instead of apache2.

We are now using php5-fpm, which means that it should be
restarted instead of apache2 web server.
Improve documentation.
Merge pull request #10 from leftclickben/RestartFpmNotApache

Restart fpm not apache