Merge pull request #19 from WenhuaChang/master

Fix installation boot parameters not written
0.710
- more flexible GetProduct() uses /etc/os-release (bnc #845606)
- 0.711
don't store log messages, this feature is not used by anyone
add access function to library state so we can access it in pbl-yaml
recognize pbl-yaml
add pbl-yaml, a commandline-wrapper around perl-Bootloader using YAML files
made argument passing a bit more clear
extend syntax to handle variable length argument lists
fix typo
added --version option
fix typo
introduce perl-Bootloader-YAML subpackage
new version: 0.800
cleanup errors messages during installation

cleanup errors messages during installation due to various config
are not created. they are handled as warnings and will not return any
config information.