Replaced boolean true with '1' to make it consistent with the rest.

Using '1' for usbroot and various ways to say true/false is inconsistent
and likely confusing. Since we can't change usbroot to use true/false,
since that would be an interface change, I've converted the others to
use '1' for true, just like usbroot.
Also fixed the check for usbroot itself, because you have to specify '1'
to enable it
Merge branch 'v1.1.x' into unify-booleans

Conflicts:
	scripts/etc/init.d/rcS
Merge pull request #120 from diederikdehaas/unify-booleans

Replaced boolean true with '1' to make it consistent with the rest.
Added binutils to the required packages
Merge pull request #124 from scaratec/master

Added binutils to the required packages
.gitignore: Match items in / only
Add raspbian-ua-netinst-*.bz2 to gitignore in preparation of #135.

The previous commit closed #131.
README.md: Various changes

This closes PR #136.
Merge branch 'master' into v1.1.x

Incorporate the latest changes from the master branch.