update dependencies to latest versions

most important one could be the update to latest shared-grunt-config,
since it brings quite a few new features.
fix issue with local rpm builds

OBS injects some variables that will be available in spec files.
However, when building locally with rpmbuild, those won't be available.
Since building locally is the default use-case for this generator,
provide a working spec file for this case and add a comment on how to
use that on OBS
Bump version to 0.11.0

Yay, new release. Mostly version updates and more robust packaging.