add configuration for syslinux

Using the build-hdd target previously used the default live-build
configuration. Now, it uses the same configuration is the
isolinux/iso-hybrid image. Using symlinks ensures that the
configurations will always be in sync.
stop running ldconfig, there is now a .git-fixup script for that
Merge pull request #11 from matthijskooijman/ready

Two fixes
Calculate version as needed, after the build
rename the .iso / .img in the deply target instead of the build / build-hdd target

This makes it easier to test in Virtualbox, since the filename of the
iso remains the same after committing something, while still using the
versioned filename for deploys.
add build-vbox-hdd target

This target builds an hdd image, and creates a Virtualbox vdi image file
from it.
use git-fs for the root filesystem

We now create the root filesystem using a git clone, which will be
detected by a patched live-boot in initramfs and handed over to git-fs.
update the origin url in the git clone in binary/live

Having an url that points to a local file on the build machine doesn't
make sense and having a proper url could allow developing and pushing
changes directly from a running image (though that requires more
changes to really work).
use a shallow git clone on in the images

This greatly reduces image sizes by cutting out old history (1.2G to
240M right now).
make the git repository non-bare

This allows the git repository to be actually used in a running system,
with the root filesystem as its worktree.
refuse to build an image when there are uncommitted changes

Since only committed changes are included in the git-fs image,
uncommitted changes usually mean you forgot to commit changes that you
wanted to include.
Fix daily builds and assume we know what we are doing with the chroot
Fix build to keep chroot/boot for lb binary_syslinux
Returning support for 486, fixing https://github.com/Webconverger/webc/issues/29
Make it build 686-pae without changing Debian Live to use FLAVOUR*
Fixes https://github.com/Webconverger/webc/issues/73
skipconfig across configurations
Apply boot=live via @LB_BOOTAPPEND_LIVE@ across the menu options
Revert "Fix build to keep chroot/boot for lb binary_syslinux"

This reverts commit 10ff268af16ef8ab5c9b5986a7a65920ff9a07d9.
Revert "Fix daily builds and assume we know what we are doing with the chroot"

This reverts commit 739c0c43647e8129b2d5a6a6ee152ee0fcad33ec.