Added support for Pileven and Wifi Access point

1) Offer option to run Freetronics Pileven setup script
2) Offer option to configure Pi as Wifi access point
NB Follows https://gist.github.com/ajfisher/a84889e64565d7a74888

Also added support for config settings in /boot/machine.local
Added more for access point
Added extra support to change "global" hostname

Can now supply a hostname and a hostname for the wifi interface
Interim commit
Made expanding the file system optional
Typo fix
Duh -- Mr Stupid! Wrong operator used
Fixed test for fs expansion
Set up /boot/machine.local