Merge pull request #1 from thliebig/master

getchroot: rewrite using functions and case clause
add update function. hide tar errors while extracting
add separate function for each chroot method
make some rewrite and tidy up, but this is still worse
add make_ functions for root user and add debootstrap options for ubuntu
update
copy /etc/resolv.conf from host to chroot
add fedora20, rename fedora to fedora19
no need to care about fstab anymore. it is taken now from the host system
better/cleaner mount and umount for chroot
mount only if mount does not already exist

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>