SAK-25661 update sakai-trunk-experimental branch; prep yaft to build against Sakai 10 trunk

1. <parent> changed to master
2. yaft base pom pruned of redundant <properties>, <respositories>, <dependencyManagement> elements in favor of pom inheritance.
3. fixed calendar api groupId.
4. deleted eclipse .classpath, .project files
5. updated .gitignore
6. updated <scm> (point to Git not SVN)
7. updated spring dependencies
8. other misc. cleanup

Cheers,

Anth