Add maven wagon providers: opoopress-wagon-git, opoopress-wagon-github.
Adjust module 'opoopress-support'
Change logging framework to SLF4J.
Change logging framework to SLF4J - module: mailet
Change logging framework to SLF4J - module: support
Change logging framework to SLF4J - module: opoopress-wagon-git
Change logging framework to SLF4J - module: opoopress-wagon-github
Add modules to parent pom.xml, add dependency management.
Adjust maven plugins module.
Update .gitignore