Merge pull request #1 from visit1985/master

some features i worked on
pkgrel=1
some small documentation fixes
fixes gh-3
added hint to post_upgrade()
pkgrel=2
detailed documentation a bit
updated outdated install script functions
removed the annoying "No medium found" error message on device scan
we dont want to umount twice
added experimental support for auto-mounting degraded multi-device root partitions
removed a dead variable
fixed the "-t needs NAME=value pair" message
new md5sums
optionally disable kexec for crypto-setups
error handling if kernel image is not available on rollback
error message cosmetics
added experimental kernel version check
fixed character overflow issue in version check
Merge pull request #4 from visit1985/master

auto-mounting degraded multi-device root partitions
Merge latest changes from upstream