Ported lineChart to new Chart API

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10974 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Enable datatip by default

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10976 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c