Started reimplementing tree-treeTable selection and rowkey handling.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10001 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Introduced custom list implementation to handle treenode hierarchy easily and update rowkeys automatically.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10002 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Migrated CheckboxTreeNode

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10003 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c