releaser.sh: ensure that templates for obsolete components are deleted
Also includes:
- Comments added
- More output added to template-library-core update
- unneeded 'git push' removal in update_version_file

Fixes #29
releaser.sh: update template-library-examples to use the new Quattor version
Fixes #30
Merge pull request #33 from jouvin/template-library-tagging

releaser.sh: ensure that templates for obsolete components are deleted