[GSCKATA-40] Add SortedBag example to Exercise 9.

git-svn-id: svn+ssh://gsckata.svn.services.gs.com/svnroot/gsckata/branches/solutions-java8@103 66aded80-052e-4344-91a8-38ab96726eea
[GSCKATA-40] Add SortedBag example to Exercise 9.

git-svn-id: svn+ssh://gsckata.svn.services.gs.com/svnroot/gsckata/branches/solutions-java8@104 66aded80-052e-4344-91a8-38ab96726eea