CLOG-111 prep clog to build against Sakai 10 trunk

1. \<parent\> changed to master
2. clog base pom pruned of redundant \<properties\>, \<respositories\>, \<dependencyManagement\> elements in favor of pom inheritance.
3. added .gitignore
4. updated \<scm\> (point to Git not SVN)
5. updated spring dependencies
6. other misc. cleanup