CDN is now entirely configurable through config

* New properties added: global.extra.cdn.js and global.extra.cdn.css
which defaultly point to the latest DataTables release
* Removed dead code in Thymeleaf TableFinalizerElProcessor
* Closes dandelion/issues#143
Add support for horizontal scrolling
Fixed bugs found in https://github.com/dandelion/dandelion-datatables/pull/6
Merge branch 'master' of https://github.com/DISID/dandelion-datatables