Adds ability to run root-fs expansion non-interactively by passing the argument --expand-rootfs.

This is very useful if you need to implement an automatic disk space expansion.
First part of rastrack addition
Rastrack
Rastrack v2
Finished Rastrack Addition Possibility
Adds the ability to set the hostname
use -- in lua command line
Merge pull request #16 from OzBerryPi/feature/set-hostname

Adds the ability to set a unique hostname
Merge pull request #15 from ryanteck/master

Adds Rastrack feature we discussed via Email.
Merge pull request #14 from vpetersson/master

Adds ability to non-interactively run disk expansion with --expand-rootfs.
remove .gitignore
indentation fixes
support enabling/disabling camera support
fix lua invocation
fix typo and check for existence of start_x.elf
improve rastrack section
pull/merge with asb/master (2013-05-10)